US2023002437A1PendingUtilityA1

Ectonucleotidase inhibitors and methods of use thereof

68
Assignee: CALITHERA BIOSCIENCES INCPriority: Dec 22, 2016Filed: May 13, 2021Published: Jan 5, 2023
Est. expiryDec 22, 2036(~10.4 yrs left)· nominal 20-yr term from priority
A61P 9/00A61P 29/00A61P 25/24A61P 37/00C07H 19/167A61P 25/28A61P 35/00A61K 31/7072C07H 19/06C07H 19/067A61P 25/16A61P 25/00A61K 31/7076C07H 19/16A61K 31/7068
68
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Claims

Abstract

The invention relates to novel heterocyclic compounds and pharmaceutical preparations thereof. The invention further relates to methods of treating or preventing cancer using the novel heterocyclic compounds of the invention.

Claims

exact text as granted — not AI-modified
1 . A compound of formula (I): 
       
         
           
           
               
               
           
         
       
       or a pharmaceutically acceptable salt and/or prodrug thereof, wherein
 X is O, NR 7  or CR 7 R 8 ; 
 Y is O or S; 
 Z is NR 19 , O or S; 
 Het is heterocyclyl or heteroaryl; 
 R 1a  is selected from H, halo, hydroxy, cyano, azido, amino, C 1-6 alkyl, hydroxyC 1-6 alkyl, amino-C 1-6 alkyl, —O—C(O)—O—C 1-6 alkyl, C 1-6 acyloxy, C 1-6 alkoxy, C 2-6 alkenyl, and C 2-6 alkynyl; and 
 R 1b  is selected from H, halo, C 1-6 alkyl, hydroxy-C 1-6 alkyl, amino-C 1-6 alkyl, C 2-6 alkenyl, and C 2-6 alkynyl; or 
 R 1a  and R 1b , together with the carbon atom to which they are attached, form a C═CH 2  or C═C(H)C 1-6 alkyl; 
 R 2a  is selected from H, halo, hydroxy, cyano, azido, amino, C 1-6 alkyl, hydroxy-C 1-6 alkyl, amino-C 1-6 alkyl, C 1-6 acyloxy, —O—C(O)—O—C 1-6 alkyl, C 1-6 alkoxy, C 2-6 alkenyl, and C 2-6 alkynyl; 
 R 2b  is selected from H, halo, C 1-6 alkyl, hydroxy-C 1-6 alkyl, amino-C 1-6 alkyl, C 2-6 alkenyl, and C 2-6 alkynyl; or 
 R 2a  and R 2b , together with the carbon atom to which they are attached, form a C═CH 2  or C═C(H)C 1-6 alkyl; 
 R 3  is selected from H, alkyl, cycloalkyl, cycloalkylalkyl, heterocyclyl, heterocyclylalkyl, aryl, aralkyl, heteroaryl, heteroaralkyl, and —(CH 2 )—C(O)OR 9 ; 
 R 4  is selected from heteroaryl, alkyl, —C(O)OR 9 , —C(O)NR 11 R 12 , —S(O) 2 R 10 , —P(O(OR 11 )(OR 12 ), and —P(O(OR 11 )(NR 13 R 15 ); 
 R 5  is selected from H, cyano, alkyl, cycloalkylalkyl, heterocyclylalkyl, aralkyl, heteroaralkyl, and —C(O)OR 9 ; 
 R 6  is selected from —C(O)OR 9  and —P(O)(OR 11 )(OR 12 ); 
 each R 7  and R 8  is H 
 R 9  is independently selected from H, alkyl, acyloxyalkyl, alkenyl, alkynyl, cycloalkyl, cycloalkylalkyl, heterocyclyl, heterocyclylalkyl, aryl, aralkyl, heteroaryl, and heteroaralkyl, and —(CHR 13 ) m —Z—C(O)—R 14 ; 
 each R 10  is independently selected from alkyl, alkenyl, alkynyl, amino, cycloalkyl, cycloalkylalkyl, heterocyclyl, heterocyclylalkyl, aryl, aralkyl, heteroaryl, and heteroaralkyl; and 
 each R 11  and R 12  is independently selected from H, alkyl, cycloalkyl, cycloalkylalkyl, heterocyclyl, heterocyclylalkyl, aryl, aralkyl, heteroaryl, heteroaralkyl and —(CHR 13 ) m —Z—C(O)—R 14 ; or 
 R 11  and R 12 , together with the atoms to which they are attached, form a 5- to 7-membered heterocyclyl; and 
 each R 13  is independently H or alkyl; 
 each R 14  is independently selected from alkyl, aminoalkyl, heterocyclyl, and heterocyclylalkyl; 
 R 15  is selected from alkyl, aralkyl, —C(R 16 )(R 17 )—C(O)O—R 18 ; 
 each R 16  and R 17  are selected from H, alkyl, amino-alkyl, hydroxy-alkyl, mercapto-alkyl, sulfonyl-alkyl, cycloalkyl, aryl, aralkyl, heterocyclylalkyl, heteroaralkyl, and —(CH 2 )C(O)OR 9 ; 
 R 18  is selected from H, alkyl, alkoxyalkyl, aminoalkyl, haloalkyl, amido, cycloalkyl, cycloalkylalkyl, heterocyclyl, heterocyclylalkyl, aryl, aralkyl, heteroaryl, heteroaralkyl; 
 R 19  is H or alkyl, preferably H; and 
 m is 1 or 2; 
 
       provided that either R 4  is tetrazolyl, or R 5  is aralkyl or heteroaralkyl, or both. 
     
     
         2 .- 146 . (canceled) 
     
     
         147 . A compound selected from: 
       
         
           
                 
                 
                 
               
                     
                 
                   Cpd. 
                     
                     
                 
                   # 
                   Compound 
                   Name 
                 
                     
                 
                     
                 
                 
                 
                 
               
                   6 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydro-furan- 2-yl)methoxy)-2-benzyl- malonic acid 
                 
                     
                 
                   7 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydro-furan- 2-yl)methoxy)-2-(4- carboxybenzyl)-malonic  acid 
                 
                     
                 
                   8 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydro-furan- 2-yl)methoxy)-2-((6- chloropyridin-3-yl) methyl)malonic acid 
                 
                     
                 
                   10 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4R,5R)-5-(6- amino-9H-purin-9-yl)-4- fluoro-3-hydroxytetra- hydrofuran-2-yl)methoxy)- 2-benzylmalonic acid 
                 
                     
                 
                   12 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(4-(2- carboxyethyl)benzyl) malonic acid 
                 
                     
                 
                   13 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(3- phenoxybenzyl)malonic  acid 
                 
                     
                 
                   15 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(3- (trifluoromethoxy) benzyl)malonic acid 
                 
                     
                 
                   16 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(3- (trifluoromethyl)benzyl) malonic acid 
                 
                     
                 
                   17 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2- (naphthalen-2-ylmethyl) malonic acid 
                 
                     
                 
                   20 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(4- (trifluoromethyl)benzyl) malonic acid 
                 
                     
                 
                   21 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(4- (methylsulfonyl)benzyl) malonic acid 
                 
                     
                 
                   22 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(3- (dimethylcarbamoyl) benzyl)malonic acid 
                 
                     
                 
                   23 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2- (thiophen-3-ylmethyl) malonic acid 
                 
                     
                 
                   25 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   diethyl 2-(((2R,3R,4S,5R)- 5-(6-amino-chloro-9H- purin-9-yl)-4-fluoro-3- (isobutyryloxy)tetrahydro- furan-2-yl)methoxy)-2-(4- (trifluoromethoxy)benzyl) malonate 
                 
                     
                 
                   27 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(3- aminobenzyl)malonic  acid 
                 
                     
                 
                   28 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-benzyl-2- (((2R,3R,4S,5R)-5-(6- (benzylamino)-2- chloro-9H-purin-9-yl)- 4-fluoro-3-hydroxytetra- hydrofuran-2-yl) methoxy)malonic acid 
                 
                     
                 
                   32 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-((6- (trifluoromethyl)pyridin- 3-yl)methyl)malonic acid 
                 
                     
                 
                   34 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(4- cyanobenzyl)malonic  acid 
                 
                     
                 
                   35 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(3- cyanobenzyl)malonic  acid 
                 
                     
                 
                   36 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(4- (trifluoromethoxy)benzyl) malonic acid 
                 
                     
                 
                   37 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-3- ethoxy-3-oxo-2-(4- (trifluoromethoxy)benzyl) propanoic acid 
                 
                     
                 
                   38 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-3- ethoxy-3-oxo-2-(4- (trifluoromethoxy)benzyl) propanoic acid 
                 
                     
                 
                   39 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(4- (hydroxymethyl)benzyl) malonic acid 
                 
                     
                 
                   40 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-azido-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(3- cyanobenzyl)malonic  acid 
                 
                     
                 
                   41 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(2- azido-6-((tert-butoxy- carbonyl)amino)-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(3- cyanobenzyl)malonic  acid 
                 
                     
                 
                   42 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydro- furan-2-yl)methoxy)-2- (3-carboxybenzyl)- malonic acid 
                 
                     
                 
                   43 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(3-(1H-tetrazol-5-yl) benzyl)-2- (((2R,3R,4S,5R)-5-(6- amino-2-azido-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)malonic  acid 
                 
                     
                 
                   44 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(3- fluorobenzyl)malonic  acid 
                 
                     
                 
                   45 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   diethyl 2-(((2R,3R,4S,5R)- 5-(6-amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(3- fluorobenzyl)malonate 
                 
                     
                 
                   46 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   diethyl 2-(((2R,3R,4S,5R)- 5-(6-amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(4- fluorobenzyl)malonate 
                 
                     
                 
                   47 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(4- fluorobenzyl)malonic  acid 
                 
                     
                 
                   48 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   diethyl 2-(((2R,3R,4S,5R)- 5-(6-amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(4- (trifluoromethoxy)benzyl) malonate 
                 
                     
                 
                   49 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(3- methoxybenzyl)malonic  acid 
                 
                     
                 
                   50 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-((1H-tetrazol-5-yl) methyl)-2- (((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)malonic  acid 
                 
                     
                 
                   51 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2S,3S,4R,5R)-3- amino-5-(6-amino-2- chloro-9H-purin- 9-yl)-4- hydroxytetrahydrofuran- 2-yl)methoxy)-2- benzylmalonic acid 
                 
                     
                 
                   53 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(3-(1H-tetrazol-5-yl) benzyl)-2- (((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)malonic  acid 
                 
                     
                 
                   54 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(4-(1H-tetrazol-5-yl) benzyl)-2- (((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydro- furan-2-yl)methoxy) malonic acid 
                 
                     
                 
                   55 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3S,4R,5R)-4- amino-5-(6-amino-2- chloro-9H-purin-9-yl)-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2- benzylmalonic acid 
                 
                     
                 
                   56 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(3- hydroxybenzyl)malonic  acid 
                 
                     
                 
                   57 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5- (6-amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(4- carboxy-2-fluorobenzyl) malonic acid 
                 
                     
                 
                   58 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5- (6-amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydro-furan- 2-yl)methoxy)-2-(4- carboxy-3-fluorobenzyl) malonic acid 
                 
                     
                 
                   59 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5- (6-amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydro-furan- 2-yl)methoxy)-2-((5- (trifluoromethyl)-furan- 2-yl)methyl)malonic acid 
                 
                     
                 
                   60 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5- (6-amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydro-furan- 2-yl)methoxy)-2-(3- fluoro-4-(trifluoromethyl) benzyl)malonic acid 
                 
                     
                 
                   61 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-((3- phenylisoxazol-5-yl) methyl)malonic acid 
                 
                     
                 
                   62 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   dimethyl 2- (((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(4- (trifluoromethyl)benzyl) malonate 
                 
                     
                 
                   63 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5- (6-amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydro-furan- 2-yl)methoxy)-2-((1- benzyl-1H-pyrazol-4-yl) methyl)malonic acid 
                 
                     
                 
                   64 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-((1H-pyrazol-4-yl) methyl)-2- (((2R,3R,4S,5R)- 5-(6-amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)malonic acid 
                 
                     
                 
                   65 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(4- (benzyloxy)benzyl) malonic acid 
                 
                     
                 
                   66 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(4- hydroxybenzyl)malonic  acid 
                 
                     
                 
                   67 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydro-furan- 2-yl)methoxy)-2-((2- carboxythiazol-5-yl) methyl)malonic acid 
                 
                     
                 
                   68 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5- (6-amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydro-furan- 2-yl)methoxy)-2-((2- carboxythiazol-4-yl) methyl)malonic acid 
                 
                     
                 
                   69 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-([1,1′-biphenyl]-4- ylmethyl)-2- (((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydro-furan- 2-yl)methoxy)-3-ethoxy- 3-oxopropanoic acid 
                 
                     
                 
                   70 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   diethyl 2-(((2R,3R,4S,5R)- 5-(6-amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(4-(2- methoxy-2-oxoethyl) benzyl)malonate 
                 
                     
                 
                   71 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   diethyl 2-(((2R,3R,4S,5R)- 5-(6-amino-chloro-9H- purin-9-yl)-4-fluoro-3- (isobutyryloxy)tetrahydro- furan-2-yl)methoxy)-2- ((5-(methoxycarbonyl) thiophen-3-yl)methyl) malonate 
                 
                     
                 
                   72 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   diethyl 2-(((2R,3R,4S,5R)- 5-(6-amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran-2- yl)methoxy)-2-((5- (methoxycarbonyl)-1- methyl-1H-pyrazol-3-yl) methyl)malonate 
                 
                     
                 
                   73 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-((5- carboxy-1-methyl-1H- pyrazol-3-yl)methyl) malonic acid 
                 
                     
                 
                   74 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-benzyl-2- (((2R,3R,4S,5R)-5-(2- chloro-6-hydroxy-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)malonic  acid 
                 
                     
                 
                   75 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(4- cyano-3-fluorobenzyl) malonic acid 
                 
                     
                 
                   76 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydro-furan- 2-yl)methoxy)-2-((5- carboxythiophen-3-yl) methyl)malonic acid 
                 
                     
                 
                   77 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydro-furan- 2-yl)methoxy)-2-((5- carboxythiophen-2-yl) methyl)malonic acid 
                 
                     
                 
                   78 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(4- (carboxymethyl)benzyl) malonic acid 
                 
                     
                 
                   79 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-([1,1′-biphenyl]-4- ylmethyl)-2- (((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydro-furan- 2-yl)methoxy)malonic  acid 
                 
                     
                 
                   80 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(4- chloro-2-fluorobenzyl) malonic acid 
                 
                     
                 
                   81 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-([1,1′-biphenyl]-4- ylmethyl)-2- (((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-3- methoxy-3-oxopropanoic  acid 
                 
                     
                 
                   82 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-([1,1′-biphenyl]-4- ylmethyl)-2- (((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-3- methoxy-3-oxopropanoic  acid 
                 
                     
                 
                   83 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-((3- carboxyisoxazol-5-yl) methyl)malonic acid 
                 
                     
                 
                   84 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-([1,1′-biphenyl]-4- ylmethyl)-2- (((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydro-furan- 2-yl)methoxy)-3-ethoxy- 3-oxopropanoic acid 
                 
                     
                 
                   85 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(3- chloro-4-methoxybenzyl) malonic acid 
                 
                     
                 
                   86 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(4- sulfamoylbenzyl)malonic  acid 
                 
                     
                 
                   87 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydro-furan- 2-yl)methoxy)-2-(4-((2- carboxy-ethyl)carbamoyl) benzyl)malonic acid 
                 
                     
                 
                   88 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydro-furan- 2-yl)methoxy)-2-((2- carboxybenzofuran-5-yl) methyl)malonic acid 
                 
                     
                 
                   89 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(4- (2,2,2-trifluoroethoxy) benzyl)malonic acid 
                 
                     
                 
                   90 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(4- ((E)-2-carboxyvinyl) benzyl)malonic acid 
                 
                     
                 
                   91 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(4- (methoxycarbonyl) benzyl)malonic acid 
                 
                     
                 
                   92 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(4- (carboxymethoxy) benzyl)malonic acid 
                 
                     
                 
                   93 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-benzyl-2- (((2R,3R,4S,5R)-5-(2- chloro-6-oxo-1H-purin- 9(6H)-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)malonic  acid 
                 
                     
                 
                   94 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(4-(5- methyl-1,3,4-oxadiazol- 2-yl)benzyl)malonic acid 
                 
                     
                 
                   95 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   of 2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-((2′- cyano-[1,1′-biphenyl]- 4-yl)-methyl)malonic  acid 
                 
                     
                 
                   96 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-((5- chlorobenzo[b]thiophen- 3-yl)methyl)-malonic  acid 
                 
                     
                 
                   97 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(benzo [d]thiazol-2-ylmethyl) malonic acid 
                 
                     
                 
                   98 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3R,4S,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-4-fluoro-3- hydroxytetrahydrofuran- 2-yl)methoxy)-2-(4- (methylcarbamoyl)benzyl) malonic acid 
                 
                     
                 
                   99 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   Diethyl 2- (((2R,3S,4R,5R)- 5-(6-amino-2-chloro-9H- purin-9-yl)-3,4- dihydroxytetrahydrofuran- 2-yl)methoxy)-2-benzyl  malonate 
                 
                     
                 
                   100 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   2-(((2R,3S,4R,5R)-5-(6- amino-2-chloro-9H- purin-9-yl)-3,4- dihydroxytetrahydro- furan-2-yl)methoxy)-2- (4-carboxybenzyl) malonic acid 
                 
                     
                 
                   101 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   S)-2-(((2R,3S,4R,5R)- 5-(6-amino-2-chloro- 9H-purin-9-yl)-3,4- dihydroxytetrahydro- furan-2-yl)methoxy)- 2-(1H-tetrazol-5-yl) acetic acid 
                 
                     
                 
                   102 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   (R)-2-(((2R,3S,4R,5R)- 5-(6-amino-2-chloro- 9H-purin-9-yl)-3,4- dihydroxytetrahydro- furan-2-yl)methoxy)-2- (1H-tetrazol-5-yl)acetic  acid 
                 
                     
                 
                   103 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   (S)-2-(((2R,3S,4R,5R)- 5-(6-amino-2-chloro- 9H-purin-9-yl)-3,4- dihydroxytetrahydro- furan-2-yl)methoxy)- 3-phenyl-2-(1H-tetrazol- 5-yl)propanoic acid 
                 
                     
                 
                   104 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   (R)-2-(((2R,3S,4R,5R)- 5-(6-amino-2-chloro- 9H-purin-9-yl)-3,4- dihydroxytetrahydro- furan-2-yl)methoxy)-3- phenyl-2-(1H-tetrazol- 5-yl)propanoic acid 
                 
                     
                 
                   105 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   (S)-2-(((2R,3S,4R,5R)- 5-(6-amino-2-methoxy- 9H-purin-9-yl)-3,4- dihydroxytetrahydro- furan-2-yl)methoxy)-3- phenyl-2-(1H-tetrazol- 5-yl)propanoic acid 
                 
                     
                 
                   106 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                   (R)-2-(((2R,3S,4R,5R)- 5-(6-amino-2-methoxy- 9H-purin-9-yl)-3,4- dihydroxytetrahydro- furan-2-yl)methoxy)-3- phenyl-2-(1H-tetrazol- 5-yl)propanoic acid 
                 
                     
                 
             
                
                
                
                
               
               
                
               
            
             
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
               
            
           
         
       
       
         
           
                 
                 
               
                     
                 
                   Cpd. # 
                   Compound 
                 
                     
                 
                   108 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   109 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   110 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   111 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   113 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   114 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   115 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   116 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   117 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   118 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   119 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   120 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   122 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   123 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   124 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   125 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   126 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   127 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   128 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   129 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   130 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   131 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   133 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   134 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   135 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   136 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   138 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   139 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   140 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   141 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   142 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   143 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   144 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   145 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   146 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   147 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   148 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   149 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   150 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   151 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   152 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   153 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   154 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   155 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   156 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   157 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   158 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   159 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   160 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   161 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   162 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   163 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   164 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   165 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   166 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   167 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   168 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   169 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   170 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   171 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   172 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   173 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   174 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   175 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   176 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   177 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   178 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   179 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   180 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   181 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   182 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   183 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   184 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   185 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   186 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   187 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   188 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   189 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   190 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   191 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   192 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   193 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   194 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   195 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   196 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   197 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   198 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   199 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   200 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   201 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   202 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   203 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
                   204 
                   
                     
                       
                       
                           
                           
                       
                     
                   
                 
                     
                 
             
                
                
                
               
               
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
                
               
            
           
         
       
       or a pharmaceutically acceptable salt thereof. 
     
     
         148 . A compound selected from: 
       
         
           
           
               
               
           
         
         
           
           
               
               
           
         
       
       or a pharmaceutically acceptable salt thereof. 
     
     
         149 . A pharmaceutical composition comprising the compound  claim 1 , or a pharmaceutically acceptable salt thereof, and one or more pharmaceutically acceptable excipients. 
     
     
         150 . A method of inhibiting CD73 in a cell, comprising contacting the cell with a compound of formula (I), or a pharmaceutically acceptable salt thereof, according to  claim 1 . 
     
     
         151 . The method of  claim 150 , wherein contacting the cell occurs in a subject in need thereof, thereby treating a disease or disorder selected from cancer, cerebral and cardiac ischemic diseases, fibrosis, immune and inflammatory disorders, inflammatory gut motility disorder, neurological, neurodegenerative and CNS disorders and diseases, depression, Parkinson's disease, and sleep disorders. 
     
     
         152 . The method of  claim 151 , wherein the cancer is selected from bladder cancer, bone cancer, brain cancer, breast cancer, cardiac cancer, cervical cancer, colon cancer, colorectal cancer, esophageal cancer, fibrosarcoma, gastric cancer, gastrointestinal cancer, head & neck cancer, Kaposi's sarcoma, kidney cancer, leukemia, liver cancer, lung cancer, lymphoma, melanoma, myeloma, ovarian cancer, pancreatic cancer, penile cancer, prostate cancer, testicular germcell cancer, thymoma and thymic carcinoma. 
     
     
         153 .- 158 . (canceled)

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