Inhibitors of flaviviridae viruses

Abstract

Provided are compounds of Formula I: and pharmaceutically acceptable salts and esters thereof. The compounds, compositions, and methods provided are useful for the treatment of Flaviviridae virus infections, particularly hepatitis C infections.

What is claimed is: 
     
         1 . A compound of Formula I: 
       
         
           
           
               
               
           
         
       
       or a pharmaceutically acceptable salt or ester thereof, wherein:
 R 1  is selected from the group consisting of optionally substituted C 1-12  alkyl, optionally substituted C 2-12  alkenyl, optionally substituted C 2-12  alkynyl, optionally substituted C 3-12  cycloalkyl, optionally substituted C 6-14  aryl, optionally substituted 3-14 membered heteroaryl, optionally substituted 3-12 membered heterocyclyl, optionally substituted 3-18 membered heteroarylalkyl, optionally substituted 3-18 membered heterocyclylalkyl and optionally substituted C 6-18  arylalkyl, wherein, each substituted R 1  is substituted with one or more Q 1 ; 
 each Q 1  is independently selected from the group consisting of halogen, oxo, oxide, —NO 2 , —N(═O), —SR 10 , —S(O)R 10 , —S(O) 2 R 10 , —S(O) 2 NR 10 R 11 , —NR 10 C(O)R 11 , —NR 10 C(O)NR 11 R 12 , —NR 10 S(O)R 11 , —NR 10 S(O) 2 R 11 , —OP(O)R 11 R 12 , —P(O)R 11 R 12 , —P(O)OR 11 R 12 , —P(O)(OR 11 )OR 12 , —C(O)NR 11 R 12 , optionally substituted C 1-6  alkyl, optionally substituted C 2-6  alkenyl, optionally substituted C 2-6  alkynyl, optionally substituted C 3-6  cycloalkyl, optionally substituted C 6-12  arylalkyl, optionally substituted C 6-12  aryl, optionally substituted 3-14 membered heteroaryl, optionally substituted C 1-6  alkyloxy, optionally substituted C 2-6  alkenyloxy, optionally substituted C 2-6  alkynyloxy, optionally substituted C 3-6  cycloalkyloxy, optionally substituted C 6-12  aryloxy, optionally substituted 3-14 membered heteroaryloxy, optionally substituted 4-12 membered heterocyclyloxy, optionally substituted —C(O)C 1-6  alkyl, optionally substituted —C(O)C 2-6  alkenyl, optionally substituted —C(O)C 2-6  alkynyl, optionally substituted —C(O)C 3-6  cycloalkyl, optionally substituted —C(O)C 6-12  aryl, optionally substituted —C(O)-3-14 membered heteroaryl, optionally substituted —C(O)C 6-12  arylalkyl, optionally substituted-3-10 membered 
 
       heterocyclyl, —OH, —NR 11 R 12 , —C(O)OR 10 , —CN, —N 3 , —C(═NR 13 )NR 11 R 12 , —C(═NR 13 )OR 10 , —NR 10 C(═NR 13 )NR 11 R 12 , —NR 11 C(O)OR 10 , and —OC(O)NR 11 R 12 ;
 each R 10 , R 11 , and R 12 , independently, is selected from the group consisting of H, optionally substituted C 1-12  alkyl, optionally substituted C 2-12  alkenyl, optionally substituted C 2-12  alkynyl, optionally substituted C 3-12  cycloalkyl, optionally substituted C 6-14  aryl, optionally substituted 3-14 membered heteroaryl, optionally substituted 3-12 membered heterocyclyl, optionally substituted 3-18 membered heteroarylalkyl, and optionally substituted C 6-18  arylalkyl; 
 or R 11  and R 12  taken together with the atoms to which they are attached form a 3 to 10 membered heterocyclyl; 
 each R 13 , independently, is selected from the group consisting of H, optionally substituted C 1-12  alkyl, optionally substituted C 2-12  alkenyl, optionally substituted C 2-12  alkynyl, optionally substituted C 3-12  cycloalkyl, optionally substituted C 6-14  aryl, optionally substituted 3-14 membered heteroaryl, optionally substituted 3-12 membered heterocyclyl, optionally substituted 3-18 membered heteroarylalkyl, optionally substituted C 6-18  arylalkyl, —CN, —C(O)R 14 , —CHO and —S(O) 2 R 14 ; 
 each R 14 , independently, is optionally substituted C 1-12  alkyl; 
 wherein, each substituted Q 1 , substituted R 10 , substituted R 11 , substituted R 12 , substituted R 13 , or substituted R 14  is independently substituted with one or more Q 6 ; 
 R 2  is selected from the group consisting of optionally substituted C 1-12  alkyl, optionally substituted C 2-12  alkenyl, optionally substituted C 2-12  alkynyl, optionally substituted C 3-12  cycloalkyl, optionally substituted C 6-14  aryl, optionally substituted 3-14 membered heteroaryl, optionally substituted 3-12 membered heterocyclyl, optionally substituted 3-18 membered heteroarylalkyl, and optionally substituted C 6-18  arylalkyl; 
 wherein, each substituted R 2  is substituted with one or more Q 2 ; 
 each Q 2 , independently, is selected from the group consisting of halogen, oxo, oxide, —NO 2 , —N(═O), —SR 20 , —S(O)R 20 , —S(O) 2 R 20 , —S(O) 2 NR 20 R 21 , —NR 20 C(O)R 21 , —NR 20 C(O)NR 21 R 22 , —NR 20 S(O)R 21 , —NR 20 S(O) 2 R 21 , —OP(O)R 21 R 22 , —P(O)R 21 R 22 , —P(O)OR 21 R 22 , —P(O)(OR 21 )OR 22 , —C(O)NR 21 R 22 , optionally substituted C 1-6  alkyl, optionally substituted C 2-6  alkenyl, optionally substituted C 2-6  alkynyl, optionally substituted C 3-6  cycloalkyl, optionally substituted C 6-12  arylalkyl, optionally substituted C 6-12  aryl, optionally substituted 3-14 membered heteroaryl, optionally substituted C 1-6  alkyloxy, optionally substituted C 2-6  alkenyloxy, optionally substituted C 2-6  alkynyloxy, optionally substituted C 3-6  cycloalkyloxy, optionally substituted C 6-12  aryloxy, optionally substituted 3-14 membered heteroaryloxy, optionally substituted 4-12 membered heterocyclyloxy, optionally substituted —C(O)C 1-6  alkyl, optionally substituted —C(O)C 2-6  alkenyl, optionally substituted —C(O)C 2-6  alkynyl, optionally substituted —C(O)C 3-6  cycloalkyl, optionally substituted —C(O)C 6-12  aryl, optionally substituted —C(O)-3-14 membered heteroaryl, optionally substituted —C(O)C 6-12  arylalkyl, optionally substituted 3-10 membered 
 
       heterocyclyl, —OH, —NR 21 R 22 , —C(O)OR 20 , —CN, —N 3 , —C(═NR 23 )NR 21 R 22 , —C(═NR 23 )OR 20 , —NR 20 C(═NR 23 )NR 21 R 22 , —NR 21 C(O)OR 20 , and —OC(O)NR 21 R 22 ;
 each R 20 , R 21 , and R 22 , independently, is selected from the group consisting of H, optionally substituted C 1-12  alkyl, optionally substituted C 2-12  alkenyl, optionally substituted C 2-12  alkynyl, optionally substituted C 3-12  cycloalkyl, optionally substituted C 6-14  aryl, optionally substituted 3-14 membered heteroaryl, optionally substituted 3-12 membered heterocyclyl, optionally substituted 3-18 membered heteroarylalkyl, and optionally substituted C 6-18  arylalkyl; 
 or R 21  and R 22  taken together with the atoms to which they are attached form a 3 to 10 membered heterocyclyl; 
 each R 23 , independently, is selected from the group consisting of H, optionally substituted C 1-12  alkyl, optionally substituted C 2-12  alkenyl, optionally substituted C 2-12  alkynyl, optionally substituted C 3-12  cycloalkyl, optionally substituted C 6-14  aryl, optionally substituted 3-14 membered heteroaryl, optionally substituted 3-12 membered heterocyclyl, optionally substituted 3-18 membered heteroarylalkyl, optionally substituted C 6-18  arylalkyl, —CN, —C(O)R 24 , —CHO and —S(O) 2 R 24 ; 
 each R 24  individually is optionally substituted C 1-12  alkyl; 
 wherein, each substituted Q 2 , substituted R 20 , substituted R 21 , substituted R 22 , substituted R 23 , or substituted R 24  is independently substituted with one or more Q 6 ; 
 R 3  is selected from the group consisting of optionally substituted C 1-12  alkylene, C 2-12  alkenylene, substituted C 2-12  alkenylene, C 2-12  alkynylene, substituted C 2-12  alkynylene, C 3-12  cycloalkylene, substituted C 3-12  cycloalkylene, optionally substituted C 6-14  arylene, optionally substituted 3-14 membered heteroarylene, optionally substituted 3-12 membered heterocyclylene, optionally substituted 3-18 membered heteroarylalkylene, and optionally substituted C 6-18  arylalkylene; 
 wherein each substituted R 3  is substituted with one or more Q 3 ; 
 each Q 3 , independently, is selected from the group consisting of halogen, oxo, oxide, —NO 2 , —N(═O), —SR 30 , —S(O)R 30 , —S(O) 2 R 30 , —S(O) 2 NR 30 R 31 , —NR 30 C(O)R 31 , —NR 30 C(O)NR 31 R 32 , —NR 30 S(O)R 31 , —NR 30 S(O) 2 R 31 , —OP(O)R 31 R 32 , —P(O)R 31 R 32 , —P(O)OR 31 R 32 , —P(O)(OR 31 )OR 32 , —C(O)NR 31 R 32 , optionally substituted C 1-6  alkyl, optionally substituted C 2-6  alkenyl, optionally substituted C 2-6  alkynyl, optionally substituted C 3-6  cycloalkyl, optionally substituted C 6-12  arylalkyl, optionally substituted C 6-12  aryl, optionally substituted 3-14 membered heteroaryl, optionally substituted C 1-6  alkyloxy, optionally substituted C 2-6  alkenyloxy, optionally substituted C 2-6  alkynyloxy, optionally substituted C 3-6  cycloalkyloxy, optionally substituted C 6-12  aryloxy, optionally substituted 3-14 membered heteroaryloxy, optionally substituted 4-12 membered heterocyclyloxy, optionally substituted —C(O)C 1-6  alkyl, optionally substituted —C(O)C 2-6  alkenyl, optionally substituted —C(O)C 2-6  alkynyl, optionally substituted —C(O)C 3-6  cycloalkyl, optionally substituted —C(O)C 6-12  aryl, optionally substituted —C(O)-3-14 membered heteroaryl, optionally substituted —C(O)C 6-12  arylalkyl, optionally substituted 3-10 membered 
 
       heterocyclyl, —OH, —NR 31 R 32 , —C(O)OR 30 , —CN, —N 3 , —C(═NR 33 )NR 31 R 32 , —C(═NR 33 )OR 30 , —NR 30 C(═NR 33 )NR 31 R 32 , —NR 31 C(O)OR 30 , and —OC(O)NR 31 R 32 ;
 each R 30 , R 31 , and R 32 , independently is selected from the group consisting of H, optionally substituted C 1-12  alkyl, optionally substituted C 2-12  alkenyl, optionally substituted C 2-12  alkynyl, optionally substituted C 3-12  cycloalkyl, optionally substituted C 6-14  aryl, optionally substituted 3-14 membered heteroaryl, optionally substituted 3-12 membered heterocyclyl, optionally substituted 3-18 membered heteroarylalkyl, and optionally substituted C 6-18  arylalkyl; 
 or R 31  and R 32  taken together with the atoms to which they are attached form a 3 to 10 membered heterocyclyl; 
 each R 33  independently is selected from the group consisting of H, optionally substituted C 1-12  alkyl, optionally substituted C 2-12  alkenyl, optionally substituted C 2-12  alkynyl, optionally substituted C 3-12  cycloalkyl, optionally substituted C 6-14  aryl, optionally substituted 3-14 membered heteroaryl, optionally substituted 3-12 membered heterocyclyl, optionally substituted 3-18 membered heteroarylalkyl, optionally substituted C 6-18  arylalkyl, —CN, —C(O)R 34 , —CHO and —S(O) 2 R 34 ; 
 each R 34  individually is optionally substituted C 1-12  alkyl; 
 wherein, each substituted Q 3 , substituted R 30 , substituted R 31 , substituted R 32 , substituted R 33 , or substituted R 34  is independently substituted with one or more Q 6 ; 
 L is selected from the group consisting of —O—, —S—, —S(O)—, and —S(O) 2 —; 
 Het is an optionally substituted 3-12 membered heterocyclyl or optionally substituted 3-14 membered heteroaryl; 
 wherein, each substituted Het is substituted with one or more Q 4 ; 
 each Q 4 , independently, is selected from the group consisting of halogen, oxo, oxide, —NO 2 , —N(═O), —S(O)R 40 , —S(O) 2 R 40 , —S(O) 2 NR 40 R 41 , —NR 40 C(O)R 41 , —NR 40 C(O)NR 41 R 42 , —NR 40 S(O)R 41 , —NR 40 S(O) 2 R 41 , —OP(O)R 41 R 42 , —P(O)R 41 R 42 , —P(O)OR 41 R 42 , —P(O)(OR 41 )OR 42 , —C(O)NR 41 R 42 , optionally substituted C 1-6  alkyl, optionally substituted C 2-6  alkenyl, optionally substituted C 2-6  alkynyl, optionally substituted C 3-6  cycloalkyl, optionally substituted C 6-12  arylalkyl, optionally substituted C 6-12  aryl, optionally substituted 3-14 membered heteroaryl, optionally substituted C 1-6  alkyloxy, optionally substituted C 2-6  alkenyloxy, optionally substituted C 2-6  alkynyloxy, optionally substituted C 3-6  cycloalkyloxy, optionally substituted C 6-12  aryloxy, optionally substituted 3-14 membered heteroaryloxy, optionally substituted 4-12 membered heterocyclyloxy, optionally substituted —C(O)C 1-6  alkyl, optionally substituted —C(O)C 2-6  alkenyl, optionally substituted —C(O)C 2-6  alkynyl, optionally substituted —C(O)C 3-6  cycloalkyl, optionally substituted —C(O)C 6-12  aryl, optionally substituted —C(O)-3-14 membered heteroaryl, optionally substituted —C(O)C 6-12  arylalkyl, optionally substituted 3-10 membered 
 
       heterocyclyl, —OH, —NR 41 R 42 , —C(O)OR 40 , —CN, —N 3 , —C(═NR 43 )NR 41 R 42 , —C(═NR 43 )OR 40 , —NR 40 C(═NR 43 )NR 41 R 42 , —NR 41 C(O)OR 40 , and —OC(O)NR 41 R 42 ;
 each R 40 , R 41 , and R 42 , independently is selected from the group consisting of H, optionally substituted C 1-12  alkyl, optionally substituted C 2-12  alkenyl, optionally substituted C 2-12  alkynyl, optionally substituted C 3-12  cycloalkyl, optionally substituted C 6-14  aryl, optionally substituted 3-14 membered heteroaryl, optionally substituted 3-12 membered heterocyclyl, optionally substituted 3-18 membered heteroarylalkyl, and optionally substituted C 6-18  arylalkyl; 
 or R 41  and R 42  taken together with the atoms to which they are attached form a 3 to 10 membered heterocyclyl; 
 each R 43 , independently, is selected from the group consisting of H, optionally substituted C 1-12  alkyl, optionally substituted C 2-12  alkenyl, optionally substituted C 2-12  alkynyl, optionally substituted C 3-12  cycloalkyl, optionally substituted C 6-14  aryl, optionally substituted 3-14 membered heteroaryl, optionally substituted 3-12 membered heterocyclyl, optionally substituted 3-18 membered heteroarylalkyl, optionally substituted C 6-18  arylalkyl, —CN, —C(O)R 44 , —CHO and —S(O) 2 R 44 ; 
 each R 44  individually is optionally substituted C 1-12  alkyl; 
 wherein, each substituted Q 4 , substituted R 40 , substituted R 41 , substituted R 42 , substituted R 43 , or substituted R 44  is independently substituted with one or more Q 5 ; 
 each Q 5 , individually, is selected from the group consisting of halogen, oxo, oxide, —NO 2 , —N(═O), —SR 50 , —S(O)R 50 , —S(O) 2 R 50 , —S(O) 2 NR 50 R 51 , —NR 50 C(O)R 51 , —NR 50 C(O)NR 51 R 52 , —NR 50 S(O)R 51 , —NR 50 S(O) 2 R 51 , —OP(O)R 51 R 52 , —P(O)R 51 R 52 , —P(O)OR 51 R 52 , —P(O)(OR 51 )OR 52 , —C(O)NR 51 R 52 , optionally substituted C 1-6  alkyl, optionally substituted C 2-6  alkenyl, optionally substituted C 2-6  alkynyl, optionally substituted C 3-6  cycloalkyl, optionally substituted C 6-12  arylalkyl, optionally substituted C 6-12  aryl, optionally substituted 3-14 membered heteroaryl, optionally substituted C 1-6  alkyloxy, optionally substituted C 2-6  alkenyloxy, optionally substituted C 2-6  alkynyloxy, optionally substituted C 3-6  cycloalkyloxy, optionally substituted C 6-12  aryloxy, optionally substituted 3-14 membered heteroaryloxy, optionally substituted 4-12 membered heterocyclyloxy, optionally substituted —C(O)C 1-6  alkyl, optionally substituted —C(O)C 2-6  alkenyl, optionally substituted —C(O)C 2-6  alkynyl, optionally substituted —C(O)C 3-6  cycloalkyl, optionally substituted —C(O)C 6-12  aryl, optionally substituted —C(O)-3-14 membered heteroaryl, optionally substituted —C(O)C 6-12  arylalkyl, optionally substituted 3-10 membered 
 
       heterocyclyl, —OH, —NR 51 R 52 , —C(O)OR 50 , —CN, —N 3 , —C(═NR 53 )NR 51 R 52 , —C(═NR 53 )OR 50 , —NR 50 C(═NR 53 )NR 51 R 52 , —NR 51 C(O)OR 50 , and —OC(O)NR 51 R 52 ;
 each R 50 , R 51 , and R 52 , independently is selected from the group consisting of H, optionally substituted C 1-12  alkyl, optionally substituted C 2-12  alkenyl, optionally substituted C 2-12  alkynyl, optionally substituted C 3-12  cycloalkyl, optionally substituted C 6-14  aryl, optionally substituted 3-14 membered heteroaryl, optionally substituted 3-12 membered heterocyclyl, optionally substituted 3-18 membered heteroarylalkyl, and optionally substituted C 6-18  arylalkyl; 
 or R 51  and R 52  taken together with the atoms to which they are attached form a 3 to 10 membered heterocyclyl; 
 each R 53 , independently, is selected from the group consisting of H, optionally substituted C 1-12  alkyl, optionally substituted C 2-12  alkenyl, optionally substituted C 2-12  alkynyl, optionally substituted C 3-12  cycloalkyl, optionally substituted C 6-14  aryl, optionally substituted 3-14 membered heteroaryl, optionally substituted 3-12 membered heterocyclyl, optionally substituted 3-18 membered heteroarylalkyl, optionally substituted C 6-18  arylalkyl, —CN, —C(O)R 54 , —CHO and —S(O) 2 R 54 ; 
 each R 54 , independently, is optionally substituted C 1-12  alkyl; 
 wherein, each substituted Q 5 , substituted R 50 , substituted R 51 , substituted R 52 , substituted R 53 , or substituted R 54  is independently substituted with one or more Q 6 ; 
 each Q 6 , independently, is selected from the group consisting of halogen, oxo, oxide, —NO 2 , —N(═O), —SR 60 , —S(O)R 60 , —S(O) 2 R 60 , —S(O) 2 NR 60 R 61 , —NR 60 C(O)R 61 , —NR 60 C(O)NR 61 R 62 , —NR 60 S(O)R 61 , —NR 60 S(O) 2 R 61 , —OP(O)R 61 R 62 , —P(O)R 61 R 62 , —P(O)OR 61 R 62 , —P(O)(OR 61 )OR 62 , —C(O)NR 61 R 62 , C 1-6  alkyl, C 2-6  alkenyl, C 2-6  alkynyl, C 3-6  cycloalkyl, C 6-12  arylalkyl, C 6-12  aryl, 3-14 membered heteroaryl, C 1-6  alkyloxy, C 2-6  alkenyloxy, C 2-6  alkynyloxy, C 3-6  cycloalkyloxy, C 6-12  aryloxy, 3-14 membered heteroaryloxy, 4-12 membered heterocyclyloxy, —C(O)C 1-6  alkyl, —C(O)C 2-6  alkenyl, —C(O)C 2-6  alkynyl, —C(O)C 3-6  cycloalkyl, —C(O)C 1-6  haloalkyl, —C(O)C 6-12  aryl, —C(O)-3-14 membered heteroaryl, —C(O)C 6-12  arylalkyl, 3-10 membered heterocyclyl, —OH, —NR 61 R 62 , —C(O)OR 60 , —CN, —N 3 , —C(═NR 63 )NR 61 R 62 , —C(═NR 63 )OR 60 , —NR 60 C(═NR 63 )NR 61 R 62 , —NR 61 C(O)OR 60 , and —OC(O)NR 61 R 62 ; 
 each R 60 , R 61 , and R 62 , independently, is selected from the group consisting of H, C 1-12  alkyl, C 2-12  alkenyl, C 2-12  alkynyl, C 3-12  cycloalkyl, C 1-12  haloalkyl, C 6-14  aryl, 3-14 membered heteroaryl, 3-12 membered heterocyclyl, 3-18 membered heteroarylalkyl, and C 6-18  arylalkyl; 
 or R 61  and R 62  taken together with the atoms to which they are attached form a 3 to 10 membered heterocyclyl; 
 each R 63  independently is selected from the group consisting of H, C 1-12  alkyl, C 2-12  alkenyl, C 2-12  alkynyl, C 3-12  cycloalkyl, C 6-14  aryl, 3-14 membered heteroaryl, 3-12 membered heterocyclyl, 3-18 membered heteroarylalkyl, C 6-18  arylalkyl, —CN, —C(O)R 64 , —CHO and —S(O) 2 R 64 ; and 
 each R 64  individually is C 1-12  alkyl. 
 
     
     
         2 . The compound of  claim 1 , wherein R 1  is optionally substituted C 1-12  alkyl or optionally substituted C 3-12  cycloalkyl. 
     
     
         3 . The compound of  claim 2 , wherein R 1  is optionally substituted C 3 -C 7  secondary or tertiary alkyl or optionally substituted C 3 -C 5  cycloalkyl. 
     
     
         4 . The compound of  claim 2 , wherein R 2  is optionally substituted methylcyclohexyl or optionally substituted methylcyclohexenyl. 
     
     
         5 . The compound of  claim 4 , wherein R 2  is 
       
         
           
           
               
               
           
         
       
     
     
         6 . The compound of  claim 4 , wherein R 2  is 
       
         
           
           
               
               
           
         
       
     
     
         7 . The compound of  claim 2 , wherein R 3  is optionally substituted C 1-12  alkylene, C 3-12  cycloalkylene, substituted C 3-12  cycloalkylene, optionally substituted C 6-14  arylene or optionally substituted 3-12 membered heterocyclylene. 
     
     
         8 . The compound of  claim 2 , wherein Het is an optionally substituted 3-12 membered heterocyclyl or optionally substituted 3-14 membered heteroaryl wherein said optionally substituted 3-12 membered heterocyclyl or optionally substituted 3-14 membered heteroaryl comprises one to four heteroatoms selected from O, S, or N. 
     
     
         9 . The compound of  claim 8 , wherein Het is optionally substituted pyridinyl, optionally substituted pyridazinyl, optionally substituted tetrahydro-2H-pyranyl, optionally substituted piperidinyl, optionally substituted pyrrolidinyl, optionally substituted tetrahydrothiophenyl, optionally substituted pyrazinyl, optionally substituted 1H-tetrazolyl, optionally substituted azetidinyl, optionally substituted tetrahydrofuranyl, optionally substituted tetrahydro-2H-furo[2,3-b]furanyl, optionally substituted thiazoyl, optionally substituted 1H-imidazolyl, optionally substituted 4H-1,2,4-triazolyl, optionally substituted 1H-pyrazolyl, optionally substituted 1,3,4-thiadiazolyl, optionally substituted quinolinyl, optionally substituted [1,2,4]triazolo[4,3-a]pyridinyl, optionally substituted thiophenyl, optionally substituted 1,2,4-thiadiazolyl, optionally substituted pyrimidinyl, optionally substituted 1H-1,2,3-triazolyl, optionally substituted 1,3,4-oxadiazolyl or optionally substituted imidazo[1,2-b]pyridazinyl. 
     
     
         10 . The compound of  claim 3  represented by Formula II: 
       
         
           
           
               
               
           
         
       
       or pharmaceutically acceptable salts and esters thereof, wherein: 
       R 2  is optionally substituted 4-methylcyclohexyl or optionally substituted methylcyclohexenyl. 
     
     
         11 . The compound of  claim 10 , wherein R 2  is 
       
         
           
           
               
               
           
         
       
     
     
         12 . The compound of  claim 10 , wherein R 2  is 
       
         
           
           
               
               
           
         
       
     
     
         13 . The compound of  claim 10 , wherein R 3  is optionally substituted C 1-12  alkylene, C 3-12  cycloalkylene, substituted C 3-12  cycloalkylene, optionally substituted C 6-14  arylene or optionally substituted 3-12 membered heterocyclylene. 
     
     
         14 . The compound of  claim 13 , wherein R 3  is optionally substituted cyclohexylene. 
     
     
         15 . The compound of  claim 10 , wherein Het is an optionally substituted 3-12 membered heterocyclyl or optionally substituted 3-14 membered heteroaryl wherein said optionally substituted 3-12 membered heterocyclyl or optionally substituted 3-14 membered heteroaryl comprises one to four heteroatoms selected from O, S, or N. 
     
     
         16 . The compound of  claim 10 , wherein Het is optionally substituted pyridinyl, optionally substituted pyridazinyl, optionally substituted tetrahydro-2H-pyranyl, optionally substituted piperidinyl, optionally substituted pyrrolidinyl, optionally substituted tetrahydrothiophenyl, optionally substituted pyrazinyl, optionally substituted 1H-tetrazolyl, optionally substituted azetidinyl, optionally substituted tetrahydrofuranyl, optionally substituted tetrahydro-2H-furo[2,3-b]furanyl, optionally substituted thiazoyl, optionally substituted 1H-imidazolyl, optionally substituted 4H-1,2,4-triazolyl, optionally substituted 1H-pyrazolyl, optionally substituted 1,3,4-thiadiazolyl, optionally substituted quinolinyl, optionally substituted [1,2,4]triazolo[4,3-a]pyridinyl, optionally substituted thiophenyl, optionally substituted 1,2,4-thiadiazolyl, optionally substituted pyrimidinyl, optionally substituted 1H-1,2,3-triazolyl, optionally substituted 1,3,4-oxadiazolyl or optionally substituted imidazo[1,2-b]pyridazinyl. 
     
     
         17 . The compound of  claim 15 , wherein Het is optionally substituted tetrahydrofuran-3-yl or optionally substituted pyridin-2-yl. 
     
     
         18 . The compound of  claim 1  that is 
       
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
       
       or a pharmaceutically acceptable salt or ester thereof. 
     
     
         19 . A pharmaceutical composition comprising a therapeutically effective amount of a compound of  claim 1  and a pharmaceutically acceptable carrier or excipient. 
     
     
         20 . The pharmaceutical composition of  claim 19  further comprising at least one additional therapeutic agent selected from the group consisting of interferons, ribavirin or its analogs, HCV NS3 protease inhibitors, NS5a inhibitors, alpha-glucosidase 1 inhibitors, hepatoprotectants, mevalonate decarboxylase antagonists, antagonists of the renin-angiotensin system, endothelin antagonists, other anti-fibrotic agents, nucleoside or nucleotide inhibitors of HCV NS5B polymerase, non-nucleoside inhibitors of HCV NS5B polymerase, HCV NS5A inhibitors, TLR-7 agonists, cyclophillin inhibitors, HCV IRES inhibitors, pharmacokinetic enhancers and other drugs for treating HCV; or mixtures thereof. 
     
     
         21 . A method for treating a Flaviviridae viral infection comprising administering a therapeutically effective amount of a compound or pharmaceutical composition of  claim 1  to a mammal in need thereof. 
     
     
         22 . The method of  claim 21  wherein the viral infection is caused by a virus selected from the group consisting of dengue virus, yellow fever virus, West Nile virus, Japanese encephalitis virus, tick-borne encephalitis virus, Kunjin virus, Murray Valley encephalitis virus, St. Louis encephalitis virus, Omsk hemorrhagic fever virus, bovine viral diarrhea virus, Zika virus and Hepatitis C virus. 
     
     
         23 . The method of  claim 22  wherein the viral infection is caused by a Hepatitis C virus. 
     
     
         24 . The method of  claim 21  further comprising administering at least one additional therapeutic agent selected from the group consisting of interferons, ribavirin or its analogs, HCV NS3 protease inhibitors, N55a inhibitors, alpha-glucosidase 1 inhibitors, hepatoprotectants, mevalonate decarboxylase antagonists, antagonists of the renin-angiotensin system, endothelin antagonists, other anti-fibrotic agents, nucleoside or nucleotide inhibitors of HCV NS5B polymerase, non-nucleoside inhibitors of HCV NS5B polymerase, HCV NS5A inhibitors, TLR-7 agonists, cyclophillin inhibitors, HCV IRES inhibitors, pharmacokinetic enhancers and other drugs for treating HCV; or mixtures thereof.