US2016235805A1PendingUtilityA1

Hcv protease inhibitors and uses thereof

Assignee: CELGENE AVILOMICS RES INCPriority: Dec 21, 2007Filed: Oct 19, 2015Published: Aug 18, 2016
Est. expiryDec 21, 2027(~1.4 yrs left)· nominal 20-yr term from priority
A61P 31/14A61P 43/00A61P 31/16A61P 31/12C07K 5/0821C07K 5/0806C07K 5/1021C07K 5/0812C07K 5/0819C07K 5/0808C07K 5/081C07K 5/0815C07K 5/06165A61K 38/00A61P 1/16C07K 5/0827A61K 38/12C07K 5/1024A61K 38/06A61K 38/05C07K 5/12
44
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Claims

Abstract

The present invention provides compounds, pharmaceutically acceptable compositions thereof, and methods of using the same.

Claims

exact text as granted — not AI-modified
1 - 45 . (canceled) 
     
     
         46 . A method for treating an HCV protease-mediated disorder in a patient, comprising the step of administering to a patient in need thereof a compound of formula I: 
       
         
           
           
               
               
           
         
       
       or a pharmaceutically acceptable salt thereof, wherein:
 R 1  and R 1′  are independently hydrogen or optionally substituted C 1-6  aliphatic, or R 1  and R 1′  are taken together to form an optionally substituted 3-7 membered carbocyclic ring; 
 R 2a  is —OH or —NHSO 2 R 2 ; 
 R 2  is —N(R) 2  or an optionally substituted group selected from C 3-7  cycloalkyl, a bridged bicyclic, 6-10 membered aryl, 5-10 membered heteroaryl having 1-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur, or 4-7 membered heterocyclyl having 1-2 heteroatoms independently selected from nitrogen, oxygen, or sulfur; 
 each R is independently hydrogen, optionally substituted C 1-6  aliphatic, or:
 two R on the same nitrogen atom are taken together with the nitrogen to form a 4-7 membered heterocyclic ring having 1-2 heteroatoms independently selected from nitrogen, oxygen, or sulfur; 
 
 R 3  is a warhead group -L-Y, and -L-Y is selected from the following:
 (a) L is a bivalent C 2-8  straight or branched, hydrocarbon chain wherein L has at least one double bond and one or two methylene units of L are independently replaced by a functional group selected from —NRC(O)—, —C(O)NR—, —N(R)SO 2 —, —SO 2 N(R)—, —S(O)—, —SO 2 —, —OC(O)—, —C(O)O—, or —C(O)—, wherein at least one double bond is located in an alpha-beta position relative to the carbonyl, sulfoxide, or —SO 2 — functional group; and Y is hydrogen or C 1-6  aliphatic optionally substituted with oxo, halogen, NO 2 , or CN; or 
 (b) L is a bivalent C 2-8  straight or branched, hydrocarbon chain wherein L has at least one double bond and at least one methylene unit of L is replaced by a functional group selected from —C(O)—, —NRC(O)—, —C(O)NR—, —N(R)SO 2 —, —SO 2 N(R)—, —S(O)—, —SO 2 —, —OC(O)—, or —C(O)O—, wherein at least one double bond is located in an alpha-beta position relative to the carbonyl, sulfoxide, or —SO 2 — functional group, and one or two additional methylene units of L are optionally and independently replaced by cyclopropylene, —O—, —N(R)—, or —C(O)—; and Y is hydrogen or C 1-6  aliphatic optionally substituted with oxo, halogen, NO 2 , or CN; or 
 (c) L is a bivalent C 2-8  straight or branched, hydrocarbon chain wherein L has at least one double bond and at least one methylene unit of L is replaced by a functional group selected from —C(O)—, wherein at least one double bond is located in an alpha-beta position relative to the functional group, and one or two additional methylene units of L are optionally and independently replaced by cyclopropylene, —O—, —N(R)—, or —C(O)—; and Y is hydrogen or C 1-6  aliphatic optionally substituted with oxo, halogen, NO 2 , or CN; or 
 (h) L is a bivalent C 2-8  straight or branched, hydrocarbon chain wherein L has at least one alkylidenyl double bond and at least one methylene unit of L is replaced by a functional group selected from —C(O)—, —NRC(O)—, —C(O)NR—, —N(R)SO 2 —, —SO 2 N(R)—, —S(O)—, —SO 2 —, —OC(O)—, or —C(O)O—, wherein at least one double bond is located in an alpha-beta position relative to the carbonyl, sulfoxide, or —SO 2 — functional group, and one or two additional methylene units of L are optionally and independently replaced by cyclopropylene, —O—, —N(R)—, or —C(O)—; and Y is hydrogen or C 1-6  aliphatic optionally substituted with oxo, halogen, NO 2 , or CN; or 
 (i) L is a bivalent C 2-8  straight or branched, hydrocarbon chain wherein L has at least one triple bond and one or two methylene units of L are optionally and independently replaced by —NRC(O)—, —C(O)NR—, —N(R)SO 2 —, —SO 2 N(R)—, —S—, —S(O)—, —SO 2 —, —OC(O)—, or —C(O)O—, and Y is hydrogen or C 1-6  aliphatic optionally substituted with oxo, halogen, NO 2 , or CN; or 
 (k) L is a bivalent C 2-8  straight or branched, hydrocarbon chain wherein one methylene unit of L is replaced by cyclopropylene and one or two additional methylene units of L are independently replaced by —NRC(O)—, —C(O)NR—, —N(R)SO 2 —, —SO 2 N(R)—, —S—, —S(O)—, —SO 2 —, —OC(O)—, or —C(O)O—; and Y is C 1-6  aliphatic substituted with oxo, halogen, NO 2 , or CN; or 
 (l) L is a covalent bond and Y is selected from:
 (i) —CH 2 F, —CH 2 Cl, —CH 2 CN, or —CH 2 NO 2 ; or 
 (ii) C 2-6  alkenyl substituted with oxo, NO 2 , or CN, and optionally substituted with halogen; or 
 (iii) C 2-6  alkynyl optionally substituted with oxo, halogen, NO 2 , or CN; or 
 (iv) a saturated 3-4 membered heterocyclic ring having 1 heteroatom selected from oxygen or nitrogen wherein said ring is substituted with 1-2 R e  groups; or 
 (v) a saturated 5-6 membered heterocyclic ring having 1-2 heteroatoms selected from oxygen or nitrogen wherein said ring is substituted with 1-4 R e  groups; or 
 (vii) a saturated 3-6 membered carbocyclic ring, wherein said ring is substituted with 1-4 R e  groups; or 
 (viii) a partially unsaturated 3-6 membered monocyclic ring having 0-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; or 
 (ix) a partially unsaturated 3-6 membered carbocyclic ring, wherein said ring is substituted with 1-4 R e  groups; or 
 (xi) a partially unsaturated 4-6 membered heterocyclic ring having 1-2 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; or 
 (xiii) a 6-membered aromatic ring having 0-2 nitrogens wherein said ring is substituted with 1-4 R e  groups; or 
 (xv) a 5-membered heteroaryl ring having 1-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-3 R e  groups; or 
 (xvii) an 8-10 membered bicyclic, saturated, partially unsaturated, or aryl ring having 0-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; 
 
 (m) L is —C(O)— and Y is selected from:
 (i) C 1-6  alkyl substituted with oxo, halogen, NO 2 , or CN; or 
 (ii) C 2-6  alkenyl optionally substituted with oxo, halogen, NO 2 , or CN; or 
 (iii) C 2-6  alkynyl optionally substituted with oxo, halogen, NO 2 , or CN; or 
 (iv) a saturated 3-4 membered heterocyclic ring having 1 heteroatom selected from oxygen or nitrogen wherein said ring is substituted with 1-2 R e  groups; or 
 (v) a saturated 5-6 membered heterocyclic ring having 1-2 heteroatoms selected from oxygen or nitrogen wherein said ring is substituted with 1-4 R e  groups; or 
 (vii) a saturated 3-6 membered carbocyclic ring, wherein said ring is substituted with 1-4 R e  groups; or 
 (viii) a partially unsaturated 3-6 membered monocyclic ring having 0-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; or 
 (ix) a partially unsaturated 3-6 membered carbocyclic ring, wherein said ring is substituted with 1-4 R e  groups; or 
 (xi) a partially unsaturated 4-6 membered heterocyclic ring having 1-2 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; or 
 (xiii) a 6-membered aromatic ring having 0-2 nitrogens wherein said ring is substituted with 1-4 R e  groups; or 
 (xv) a 5-membered heteroaryl ring having 1-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-3 R e  groups; or 
 (xvii) an 8-10 membered bicyclic, saturated, partially unsaturated, or aryl ring having 0-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; 
 
 (n) L is —N(R)C(O)— and Y is selected from:
 (i) C 1-6  alkyl substituted with oxo, halogen, NO 2 , or CN; or 
 (ii) C 2-6  alkenyl optionally substituted with oxo, halogen, NO 2 , or CN; or 
 (iii) C 2-6  alkynyl optionally substituted with oxo, halogen, NO 2 , or CN; or 
 (iv) a saturated 3-4 membered heterocyclic ring having 1 heteroatom selected from oxygen or nitrogen wherein said ring is substituted with 1-2 R e  groups; or 
 (v) a saturated 5-6 membered heterocyclic ring having 1-2 heteroatoms selected from oxygen or nitrogen wherein said ring is substituted with 1-4 R e  groups; or 
 (vii) a saturated 3-6 membered carbocyclic ring, wherein said ring is substituted with 1-4 R e  groups; or 
 (viii) a partially unsaturated 3-6 membered monocyclic ring having 0-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; or 
 (ix) a partially unsaturated 3-6 membered carbocyclic ring, wherein said ring is substituted with 1-4 R e  groups; or 
 (xi) a partially unsaturated 4-6 membered heterocyclic ring having 1-2 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; or 
 (xiii) a 6-membered aromatic ring having 0-2 nitrogens wherein said ring is substituted with 1-4 R e  groups; or 
 (xv) a 5-membered heteroaryl ring having 1-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-3 R e  groups; or 
 (xvii) an 8-10 membered bicyclic, saturated, partially unsaturated, or aryl ring having 0-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; 
 
 (o) L is a bivalent C 1-8  saturated or unsaturated, straight or branched, hydrocarbon chain; and Y is selected from:
 (i) —CH 2 F, —CH 2 Cl, —CH 2 CN, or —CH 2 NO 2 ; or 
 (ii) C 2-6  alkenyl substituted with oxo, NO 2 , or CN, and optionally substituted with halogen; or 
 (iii) C 2-6  alkynyl optionally substituted with oxo, halogen, NO 2 , or CN; or 
 (iv) a saturated 3-4 membered heterocyclic ring having 1 heteroatom selected from oxygen or nitrogen wherein said ring is substituted with 1-2 R e  groups; or 
 (v) a saturated 5-6 membered heterocyclic ring having 1-2 heteroatoms selected from oxygen or nitrogen wherein said ring is substituted with 1-4 R e  groups; or 
 (vii) a saturated 3-6 membered carbocyclic ring, wherein said ring is substituted with 1-4 R e  groups; or 
 (viii) a partially unsaturated 3-6 membered monocyclic ring having 0-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; or 
 (ix) a partially unsaturated 3-6 membered carbocyclic ring, wherein said ring is substituted with 1-4 R e  groups; or 
 (xi) a partially unsaturated 4-6 membered heterocyclic ring having 1-2 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; or 
 (xiii) a 6-membered aromatic ring having 0-2 nitrogens wherein said ring is substituted with 1-4 R e  groups; or 
 (xv) a 5-membered heteroaryl ring having 1-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-3 R e  groups; or 
 (xvii) an 8-10 membered bicyclic, saturated, partially unsaturated, or aryl ring having 0-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; 
 
 (p) L is a covalent bond, —CH 2 —, —NH—, —C(O)—, —CH 2 NH—, —NHCH 2 —, —NHC(O)—, —NHC(O)CH 2 OC(O)—, —CH 2 NHC(O)—, —NHSO 2 —, —NHSO 2 CH 2 —, or —SO 2 NH—; and Y is selected from:
 (i) —CH 2 F, —CH 2 Cl, —CH 2 CN, or —CH 2 NO 2 ; or 
 (ii) C 2-6  alkenyl substituted with oxo, NO 2 , or CN, and optionally substituted with halogen; or 
 (iii) C 2-6  alkynyl optionally substituted with oxo, halogen, NO 2 , or CN; or 
 (iv) a saturated 3-4 membered heterocyclic ring having 1 heteroatom selected from oxygen or nitrogen wherein said ring is substituted with 1-2 R e  groups; or 
 (v) a saturated 5-6 membered heterocyclic ring having 1-2 heteroatoms selected from oxygen or nitrogen wherein said ring is substituted with 1-4 R e  groups; or 
 (vii) a saturated 3-6 membered carbocyclic ring, wherein said ring is substituted with 1-4 R e  groups; or 
 (viii) a partially unsaturated 3-6 membered monocyclic ring having 0-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; or 
 (ix) a partially unsaturated 3-6 membered carbocyclic ring, wherein said ring is substituted with 1-4 R e  groups; or 
 (xi) a partially unsaturated 4-6 membered heterocyclic ring having 1-2 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; or 
 (xiii) a 6-membered aromatic ring having 0-2 nitrogens wherein said ring is substituted with 1-4 R e  groups; or 
 (xv) a 5-membered heteroaryl ring having 1-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-3 R e  groups; or 
 (xvii) an 8-10 membered bicyclic, saturated, partially unsaturated, or aryl ring having 0-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; or 
 
 (q) -L-Y is selected from: 
 
 
       
         
           
           
               
               
           
         
         
           (r) L is a bivalent C 2-8  straight or branched, hydrocarbon chain wherein L has at least one double bond and one or two methylene units of L are independently replaced by —NRC(O)—, —C(O)NR—, —N(R)SO 2 —, —SO 2 N(R)—, —S(O)—, —SO 2 —, —OC(O)—, —C(O)O—, cyclopropylene, —O—, —N(R)—, or —C(O)—; and 
           Y is hydrogen, C 1-6  aliphatic optionally substituted with oxo, halogen, NO 2 , or CN, or a 3-10 membered monocyclic or bicyclic, saturated, partially unsaturated, or aryl ring having 0-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, and wherein said ring is substituted with 1-4 R e  groups; or 
           (s) L is a bivalent C 2-8  straight or branched, hydrocarbon chain wherein L has at least one triple bond and one or two methylene units of L are optionally and independently replaced by —NRC(O)—, —C(O)NR—, —N(R)SO 2 —, —SO 2 N(R)—, —O—, —N(R)—, —C(O)—, —S—, —S(O)—, —SO 2 —, —OC(O)—, or —C(O)O—, and 
           Y is hydrogen, C 1-6  aliphatic optionally substituted with oxo, halogen, NO 2 , or CN, or a 3-10 membered monocyclic or bicyclic, saturated, partially unsaturated, or aryl ring having 0-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, and wherein said ring is substituted with 1-4 R e  groups; or 
           (t) L is a bivalent C 2-8  straight or branched, hydrocarbon chain wherein one methylene unit of L is replaced by cyclopropylene and one or two additional methylene units of L are independently replaced by —NRC(O)—, —C(O)NR—, —N(R)SO 2 —, —SO 2 N(R)—, —S—, —O—, —N(R)—, —C(O)—, —S(O)—, —SO 2 —, —OC(O)—, or —C(O)O—, and 
           Y is C 1-6  aliphatic substituted with oxo, halogen, NO 2 , or CN, or a 3-10 membered monocyclic or bicyclic, saturated, partially unsaturated, or aryl ring having 0-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, and wherein said ring is substituted with 1-4 R e  groups;
 each R e  is independently selected from -Q-Z, oxo, NO 2 , halogen, CN, a suitable leaving group selected from alkoxy, sulphonyloxy, optionally substituted alkylsulphonyloxy, optionally substituted alkenylsulfonyloxy, optionally substituted arylsulfonyloxy, acyl, and diazonium, or C 1-6  aliphatic substituted with oxo, halogen, NO 2 , or CN, wherein:
 Q is a bivalent C 2-6  unsaturated, straight or branched, hydrocarbon chain, wherein one or two methylene units of Q are optionally and independently replaced by —N(R)—, —S—, —O—, —C(O)—, —OC(O)—, —C(O)O—, —SO—, —SO 2 —, —N(R)C(O)—, —C(O)N(R)—, —N(R)SO 2 —, or —SO 2 N(R)—; and 
 each Z is independently hydrogen or C 1-6  aliphatic substituted with oxo, halogen, NO 2 , or CN, or: 
 
 R 3  and R 1  are taken together with their intervening atoms to form an optionally substituted 12-18 membered ring having 2-6 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein the ring formed thereby comprises the warhead group -L-Y; or 
 R 3  and a ring formed by R 1  and R 1′  are taken together with their intervening atoms to form an optionally substituted 12-18 membered ring having 2-6 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein the ring formed thereby comprises the warhead group -L-Y; 
 
         
         R w  is hydrogen or an optionally substituted group selected from C 1-6  aliphatic, 6-10 membered aryl, 5-10 membered heteroaryl having 1-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur, or 4-7 membered heterocyclyl having 1-2 heteroatoms independently selected from nitrogen, oxygen, or sulfur: or
 R w  and R x  are taken together to form an optionally substituted C 3-7  membered ring having 0-2 heteroatoms independently selected from nitrogen, oxygen or sulfur, or: 
 R w  and R y  are taken together to form an optionally substituted C 3-7  membered ring having 0-2 heteroatoms independently selected from nitrogen, oxygen or sulfur; 
 
         R x  is -T-R z , wherein:
 T is a covalent bond or a C 1-6  bivalent hydrocarbon chain wherein one or two methylene units of T are optionally and independently replaced by —O—, —S—, —N(R)—, —N(R)C(O)—, —C(O)N(R)—, —S(O)—, —S(O) 2 —, —N(R)SO 2 —, or —SO 2 N(R)—; and 
 R z  is hydrogen or an optionally substituted group selected from a bridged bicyclic, or 5-membered monocyclic or bicyclic heteroaryl having 1-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur; 
 
         R x′  is hydrogen, or R x′  and R x  are taken together with their intervening atoms to form an optionally substituted spiro-fused 5-7 membered ring having 0-2 heteroatoms independently selected from nitrogen, oxygen, or sulfur; 
         R y  is hydrogen, or R x  and R y  are taken together to form an optionally substituted C 3-7  membered ring having 0-2 heteroatoms independently selected from nitrogen, oxygen or sulfur; 
         R 4  is H, —NHC(O)R 5 , —NHC(O)OR 6 , 
       
       
         
           
           
               
               
           
         
       
       or a natural or unnatural amino acid side-chain group;
 each R 5  is independently —N(R) 2  or an optionally substituted group selected from C 1-6  aliphatic, a bridged bicyclic, 6-10 membered aryl, 5-10 membered heteroaryl having 1-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur, or 4-7 membered heterocyclyl having 1-2 heteroatoms independently selected from nitrogen, oxygen, or sulfur; 
 R 6  is an optionally substituted group selected from C 1-6  aliphatic, a bridged bicyclic, 6-10 membered aryl, 5-10 membered heteroaryl having 1-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur, or 4-7 membered heterocyclyl having 1-2 heteroatoms independently selected from nitrogen, oxygen, or sulfur; and 
 R 7  is an optionally substituted group selected from C 1-6  aliphatic, a bridged bicyclic, 6-10 membered aryl, 5-10 membered heteroaryl having 1-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur, or 4-7 membered heterocyclyl having 1-2 heteroatoms independently selected from nitrogen, oxygen, or sulfur. 
 
     
     
         47 . The method of  claim 46 , wherein the compound is of formula II-a or II-b: 
       
         
           
           
               
               
           
         
       
       or a pharmaceutically acceptable salt thereof, wherein:
 R 4  is H, —NHC(O)R 5 , —NHC(O)OR 6 , or a natural or unnatural amino acid side-chain group. 
 
     
     
         48 . The method of  claim 46 , wherein the compound is of formula III-a or III-b: 
       
         
           
           
               
               
           
         
       
       or a pharmaceutically acceptable salt thereof, wherein:
 R 4  is H, —NHC(O)OR 6 , or a natural or unnatural amino acid side-chain group. 
 
     
     
         49 . The method of  claim 46 , wherein the compound is of formula IV-a or IV-b: 
       
         
           
           
               
               
           
         
       
       or a pharmaceutically acceptable salt thereof, wherein:
 R 1  and R 1′  are taken together to form an optionally substituted 3-7 membered carbocyclic ring; 
 R 2  is an optionally substituted group selected from C 3-7  cycloalkyl, bridged bicyclic, 6-10 membered aryl, 5-10 membered heteroaryl having 1-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur, or 4-7 membered heterocyclyl having 1-2 heteroatoms independently selected from nitrogen, oxygen, or sulfur; and 
 R 4  is H, —NHC(O)OR 6 , or a natural or unnatural amino acid side-chain group. 
 
     
     
         50 . The method of  claim 46 , wherein the compound is of formula V-a or V-b: 
       
         
           
           
               
               
           
         
       
       or a pharmaceutically acceptable salt thereof, wherein:
 R 2  is —N(R) 2 ; and 
 R 4  is H, —NHC(O)OR 6 , or a natural or unnatural amino acid side-chain group. 
 
     
     
         51 . The method according to  claim 46 , wherein
 L is a bivalent C 2-8  straight or branched, hydrocarbon chain wherein L has at least one double bond and at least one methylene unit of L is replaced by a functional group selected from —C(O)—, —NRC(O)—, —C(O)NR—, —N(R)SO 2 —, —SO 2 N(R)—, —S(O)—, —SO 2 —, —OC(O)—, or —C(O)O—, wherein at least one double bond is located in an alpha-beta position relative to the carbonyl, sulfoxide, or —SO 2 — functional group, and one or two additional methylene units of L are optionally and independently replaced by cyclopropylene, —O—, —N(R)—, or —C(O)—; and   Y is hydrogen or C 1-6  aliphatic optionally substituted with oxo, halogen, NO 2 , or CN.   
     
     
         52 . The method according to  claim 51 , wherein L is a bivalent C 2-8  straight or branched, hydrocarbon chain wherein L has at least one double bond and at least one methylene unit of L is replaced by a functional group selected from —C(O)—, wherein at least one double bond is located in an alpha-beta position relative to the functional group, and one or two additional methylene units of L are optionally and independently replaced by cyclopropylene, —O—, —N(R)—, or —C(O)—. 
     
     
         53 . The method according to  claim 51 , wherein L is a bivalent C 2-8  straight or branched, hydrocarbon chain wherein L has at least one double bond and at least one methylene unit of L is replaced by —OC(O)—. 
     
     
         54 . The method according to  claim 51 , wherein L is —NRC(O)CH═CH—, —NRC(O)CH═CHCH 2 N(CH 3 )—, —NRSO 2 CH═CH—, —NRSO 2 CH═CHCH 2 —, —NRC(O)CH═CHCH 2 O—, —NRC(O)C(═CH 2 )CH 2 —, or —CH 2 NRC(O)CH═CH—; wherein the R group of L is H or optionally substituted C 1-6  aliphatic; and Y is hydrogen or C 1-6  aliphatic optionally substituted with oxo, halogen, NO 2 , or CN. 
     
     
         55 . The method according to  claim 54 , wherein L is —NHC(O)CH═CH—, —NHC(O)CH═CHCH 2 N(CH 3 )—, —NHSO 2 CH═CH—, —NHSO 2 CH═CHCH 2 —, —NHC(O)CH═CHCH 2 O—, —NHC(O)C(═CH 2 )CH 2 —, or —CH 2 NHC(O)CH═CH—. 
     
     
         56 . The method according to  claim 51 , wherein L is a bivalent C 2-8  straight or branched, hydrocarbon chain wherein L has at least one alkylidenyl double bond and at least one methylene unit of L is replaced by a functional group selected from —C(O)—, —NRC(O)—, —C(O)NR—, —N(R)SO 2 —, —SO 2 N(R)—, —S(O)—, —SO 2 —, —OC(O)—, or —C(O)O—, wherein at least one double bond is located in an alpha-beta position relative to the functional group, and one or two additional methylene units of L are optionally and independently replaced by cyclopropylene, —O—, —N(R)—, or —C(O)—. 
     
     
         57 . The method according to  claim 46 , wherein
 L is a bivalent C 2-8  straight or branched, hydrocarbon chain wherein L has at least one triple bond and one or two methylene units of L are optionally and independently replaced by —NRC(O)—, —C(O)NR—, —N(R)SO 2 —, —SO 2 N(R)—, —O—, —N(R)—, —C(O)—, —S—, —S(O)—, —SO 2 —, —OC(O)—, or —C(O)O—; and   Y is hydrogen, C 1-6  aliphatic optionally substituted with oxo, halogen, NO 2 , or CN, or a 3-10 membered monocyclic or bicyclic, saturated, partially unsaturated, or aryl ring having 0-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, and wherein said ring is substituted with 1-4 R e  groups.   
     
     
         58 . The method according to  claim 57 , wherein Y is hydrogen or C 1-6  aliphatic optionally substituted with oxo, halogen, NO 2 , or CN. 
     
     
         59 . The method according to  claim 58 , wherein L is —C≡C—, —C≡CCH 2 N(isopropyl)-, —NHC(O)C≡CCH 2 CH 2 —, —CH 2 —C≡C—CH 2 —, —C≡CCH 2 O—, —CH 2 C(O)C≡C—, —C(O)C≡C—, or —CH 2 OC(═O)C≡C—. 
     
     
         60 . The method of  claim 46 , wherein:
 L is a covalent bond, —CH 2 —, —NH—, —C(O)—, —CH 2 NH—, —NHCH 2 —, —NHC(O)—, —NHC(O)CH 2 OC(O)—, —CH 2 NHC(O)—, —NHSO 2 —, —NHSO 2 CH 2 —, or —SO 2 NH—; and   Y is selected from the following:
 (i) —CH 2 F, —CH 2 Cl, —CH 2 CN, or —CH 2 NO 2 ; or 
 (ii) C 2-6  alkenyl substituted with oxo, NO 2 , or CN, and optionally substituted with halogen; or 
 (iii) C 2-6  alkynyl optionally substituted with oxo, halogen, NO 2 , or CN; or 
 (iv) a saturated 3-4 membered heterocyclic ring having 1 heteroatom selected from oxygen or nitrogen wherein said ring is substituted with 1-2 R e  groups; or 
 (v) a saturated 5-6 membered heterocyclic ring having 1-2 heteroatoms selected from oxygen or nitrogen wherein said ring is substituted with 1-4 R e  groups; or 
 (vi) 
   
       
         
           
           
               
               
           
         
         or
 (vii) a saturated 3-6 membered carbocyclic ring, wherein said ring is substituted with 1-4 R e  groups; or 
 (viii) a partially unsaturated 3-6 membered monocyclic ring having 0-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; or 
 (ix) a partially unsaturated 3-6 membered carbocyclic ring, wherein said ring is substituted with 1-4 R e  groups; or 
 (x) 
 
       
       
         
           
           
               
               
           
         
         or
 (xi) a partially unsaturated 4-6 membered heterocyclic ring having 1-2 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; or 
 (xii) 
 
       
       
         
           
           
               
               
           
         
         or
 (xiii) a 6-membered aromatic ring having 0-2 nitrogens wherein said ring is substituted with 1-4 R e  groups; or 
 (xiv) 
 
       
       
         
           
           
               
               
           
         
         or
 (xv) a 5-membered heteroaryl ring having 1-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-3 R e  groups; or 
 (xvi) 
 
       
       
         
           
           
               
               
           
         
         
           (xvii) an 8-10 membered bicyclic, saturated, partially unsaturated, or aryl ring having 0-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; or 
           (xviii) 
         
       
       
         
           
           
               
               
           
         
       
     
     
         61 . The method according to  claim 60 , wherein L is a covalent bond. 
     
     
         62 . The method according to  claim 60 , wherein Y is selected from: 
       
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
       
       wherein each R e  is independently selected from halogen. 
     
     
         63 . The method according to  claim 46 , wherein R 3  is selected from: 
       
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
       
       wherein each R e  is independently a suitable leaving group, halogen, NO 2 , CN, or oxo. 
     
     
         64 . A method for treating an HCV protease-mediated disorder in a patient, comprising the step of administering to a patient in need thereof a compound selected from the group consisting of: 
       
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
         
           
           
               
               
           
         
       
       or a pharmaceutically acceptable salt thereof. 
     
     
         65 . A method for inhibiting HCV protease, or a mutant thereof, activity in a patient comprising the step of administering to a patient in need thereof a compound of formula I: 
       
         
           
           
               
               
           
         
       
       or a pharmaceutically acceptable salt thereof, wherein:
 R 1  and R 1′  are independently hydrogen or optionally substituted C 1-6  aliphatic, or R 1  and R 1′  are taken together to form an optionally substituted 3-7 membered carbocyclic ring; 
 R 2a  is —OH or —NHSO 2 R 2 ; 
 R 2  is —N(R) 2  or an optionally substituted group selected from C 3-7  cycloalkyl, a bridged bicyclic, 6-10 membered aryl, 5-10 membered heteroaryl having 1-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur, or 4-7 membered heterocyclyl having 1-2 heteroatoms independently selected from nitrogen, oxygen, or sulfur; 
 each R is independently hydrogen, optionally substituted C 1-6  aliphatic, or:
 two R on the same nitrogen atom are taken together with the nitrogen to form a 4-7 membered heterocyclic ring having 1-2 heteroatoms independently selected from nitrogen, oxygen, or sulfur; 
 
 R 3  is a warhead group -L-Y, and -L-Y is selected from the following:
 (a) L is a bivalent C 2-8  straight or branched, hydrocarbon chain wherein L has at least one double bond and one or two methylene units of L are independently replaced by a functional group selected from —NRC(O)—, —C(O)NR—, —N(R)SO 2 —, —SO 2 N(R)—, —S(O)—, —SO 2 —, —OC(O)—, —C(O)O—, or —C(O)—, wherein at least one double bond is located in an alpha-beta position relative to the carbonyl, sulfoxide, or —SO 2 — functional group; and Y is hydrogen or C 1-6  aliphatic optionally substituted with oxo, halogen, NO 2 , or CN; or 
 (b) L is a bivalent C 2-8  straight or branched, hydrocarbon chain wherein L has at least one double bond and at least one methylene unit of L is replaced by a functional group selected from —C(O)—, —NRC(O)—, —C(O)NR—, —N(R)SO 2 —, —SO 2 N(R)—, —S(O)—, —SO 2 —, —OC(O)—, or —C(O)O—, wherein at least one double bond is located in an alpha-beta position relative to the carbonyl, sulfoxide, or —SO 2 — functional group, and one or two additional methylene units of L are optionally and independently replaced by cyclopropylene, —O—, —N(R)—, or —C(O)—; and Y is hydrogen or C 1-6  aliphatic optionally substituted with oxo, halogen, NO 2 , or CN; or 
 (c) L is a bivalent C 2-8  straight or branched, hydrocarbon chain wherein L has at least one double bond and at least one methylene unit of L is replaced by a functional group selected from —C(O)—, wherein at least one double bond is located in an alpha-beta position relative to the functional group, and one or two additional methylene units of L are optionally and independently replaced by cyclopropylene, —O—, —N(R)—, or —C(O)—; and Y is hydrogen or C 1-6  aliphatic optionally substituted with oxo, halogen, NO 2 , or CN; or 
 (h) L is a bivalent C 2-8  straight or branched, hydrocarbon chain wherein L has at least one alkylidenyl double bond and at least one methylene unit of L is replaced by a functional group selected from —C(O)—, —NRC(O)—, —C(O)NR—, —N(R)SO 2 —, —SO 2 N(R)—, —S(O)—, —SO 2 —, —OC(O)—, or —C(O)O—, wherein at least one double bond is located in an alpha-beta position relative to the carbonyl, sulfoxide, or —SO 2 — functional group, and one or two additional methylene units of L are optionally and independently replaced by cyclopropylene, —O—, —N(R)—, or —C(O)—; and Y is hydrogen or C 1-6  aliphatic optionally substituted with oxo, halogen, NO 2 , or CN; or 
 (i) L is a bivalent C 2-8  straight or branched, hydrocarbon chain wherein L has at least one triple bond and one or two methylene units of L are optionally and independently replaced by —NRC(O)—, —C(O)NR—, —N(R)SO 2 —, —SO 2 N(R)—, —S—, —S(O)—, —SO 2 —, —OC(O)—, or —C(O)O—, and Y is hydrogen or C 1-6  aliphatic optionally substituted with oxo, halogen, NO 2 , or CN; or 
 (k) L is a bivalent C 2-8  straight or branched, hydrocarbon chain wherein one methylene unit of L is replaced by cyclopropylene and one or two additional methylene units of L are independently replaced by —NRC(O)—, —C(O)NR—, —N(R)SO 2 —, —SO 2 N(R)—, —S—, —S(O)—, —SO 2 —, —OC(O)—, or —C(O)O—; and Y is C 1-6  aliphatic substituted with oxo, halogen, NO 2 , or CN; or 
 (l) L is a covalent bond and Y is selected from:
 (i) —CH 2 F, —CH 2 Cl, —CH 2 CN, or —CH 2 NO 2 ; or 
 (ii) C 2-6  alkenyl substituted with oxo, NO 2 , or CN, and optionally substituted with halogen; or 
 (iii) C 2-6  alkynyl optionally substituted with oxo, halogen, NO 2 , or CN; or 
 (iv) a saturated 3-4 membered heterocyclic ring having 1 heteroatom selected from oxygen or nitrogen wherein said ring is substituted with 1-2 R e  groups; or 
 (v) a saturated 5-6 membered heterocyclic ring having 1-2 heteroatoms selected from oxygen or nitrogen wherein said ring is substituted with 1-4 R e  groups; or 
 (vii) a saturated 3-6 membered carbocyclic ring, wherein said ring is substituted with 1-4 R e  groups; or 
 (viii) a partially unsaturated 3-6 membered monocyclic ring having 0-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; or 
 (ix) a partially unsaturated 3-6 membered carbocyclic ring, wherein said ring is substituted with 1-4 R e  groups; or 
 (xi) a partially unsaturated 4-6 membered heterocyclic ring having 1-2 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; or 
 (xiii) a 6-membered aromatic ring having 0-2 nitrogens wherein said ring is substituted with 1-4 R e  groups; or 
 (xv) a 5-membered heteroaryl ring having 1-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-3 R e  groups; or 
 (xvii) an 8-10 membered bicyclic, saturated, partially unsaturated, or aryl ring having 0-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; 
 
 (m) L is —C(O)— and Y is selected from:
 (i) C 1-6  alkyl substituted with oxo, halogen, NO 2 , or CN; or 
 (ii) C 2-6  alkenyl optionally substituted with oxo, halogen, NO 2 , or CN; or 
 (iii) C 2-6  alkynyl optionally substituted with oxo, halogen, NO 2 , or CN; or 
 (iv) a saturated 3-4 membered heterocyclic ring having 1 heteroatom selected from oxygen or nitrogen wherein said ring is substituted with 1-2 R e  groups; or 
 (v) a saturated 5-6 membered heterocyclic ring having 1-2 heteroatoms selected from oxygen or nitrogen wherein said ring is substituted with 1-4 R e  groups; or 
 (vii) a saturated 3-6 membered carbocyclic ring, wherein said ring is substituted with 1-4 R e  groups; or 
 (viii) a partially unsaturated 3-6 membered monocyclic ring having 0-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; or 
 (ix) a partially unsaturated 3-6 membered carbocyclic ring, wherein said ring is substituted with 1-4 R e  groups; or 
 (xi) a partially unsaturated 4-6 membered heterocyclic ring having 1-2 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; or 
 (xiii) a 6-membered aromatic ring having 0-2 nitrogens wherein said ring is substituted with 1-4 R e  groups; or 
 (xv) a 5-membered heteroaryl ring having 1-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-3 R e  groups; or 
 (xvii) an 8-10 membered bicyclic, saturated, partially unsaturated, or aryl ring having 0-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; 
 
 (n) L is —N(R)C(O)— and Y is selected from:
 (i) C 1-6  alkyl substituted with oxo, halogen, NO 2 , or CN; or 
 (ii) C 2-6  alkenyl optionally substituted with oxo, halogen, NO 2 , or CN; or 
 (iii) C 2-6  alkynyl optionally substituted with oxo, halogen, NO 2 , or CN; or 
 (iv) a saturated 3-4 membered heterocyclic ring having 1 heteroatom selected from oxygen or nitrogen wherein said ring is substituted with 1-2 R e  groups; or 
 (v) a saturated 5-6 membered heterocyclic ring having 1-2 heteroatoms selected from oxygen or nitrogen wherein said ring is substituted with 1-4 R e  groups; or 
 (vii) a saturated 3-6 membered carbocyclic ring, wherein said ring is substituted with 1-4 R e  groups; or 
 (viii) a partially unsaturated 3-6 membered monocyclic ring having 0-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; or 
 (ix) a partially unsaturated 3-6 membered carbocyclic ring, wherein said ring is substituted with 1-4 R e  groups; or 
 (xi) a partially unsaturated 4-6 membered heterocyclic ring having 1-2 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; or 
 (xiii) a 6-membered aromatic ring having 0-2 nitrogens wherein said ring is substituted with 1-4 R e  groups; or 
 (xv) a 5-membered heteroaryl ring having 1-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-3 R e  groups; or 
 (xvii) an 8-10 membered bicyclic, saturated, partially unsaturated, or aryl ring having 0-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; 
 
 (o) L is a bivalent C 1-8  saturated or unsaturated, straight or branched, hydrocarbon chain; and Y is selected from:
 (i) —CH 2 F, —CH 2 Cl, —CH 2 CN, or —CH 2 NO 2 ; or 
 (ii) C 2-6  alkenyl substituted with oxo, NO 2 , or CN, and optionally substituted with halogen; or 
 (iii) C 2-6  alkynyl optionally substituted with oxo, halogen, NO 2 , or CN; or 
 (iv) a saturated 3-4 membered heterocyclic ring having 1 heteroatom selected from oxygen or nitrogen wherein said ring is substituted with 1-2 R e  groups; or 
 (v) a saturated 5-6 membered heterocyclic ring having 1-2 heteroatoms selected from oxygen or nitrogen wherein said ring is substituted with 1-4 R e  groups; or 
 (vii) a saturated 3-6 membered carbocyclic ring, wherein said ring is substituted with 1-4 R e  groups; or 
 (viii) a partially unsaturated 3-6 membered monocyclic ring having 0-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; or 
 (ix) a partially unsaturated 3-6 membered carbocyclic ring, wherein said ring is substituted with 1-4 R e  groups; or 
 (xi) a partially unsaturated 4-6 membered heterocyclic ring having 1-2 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; or 
 (xiii) a 6-membered aromatic ring having 0-2 nitrogens wherein said ring is substituted with 1-4 R e  groups; or 
 (xv) a 5-membered heteroaryl ring having 1-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-3 R e  groups; or 
 (xvii) an 8-10 membered bicyclic, saturated, partially unsaturated, or aryl ring having 0-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; 
 
 (p) L is a covalent bond, —CH 2 —, —NH—, —C(O)—, —CH 2 NH—, —NHCH 2 —, —NHC(O)—, —NHC(O)CH 2 OC(O)—, —CH 2 NHC(O)—, —NHSO 2 —, —NHSO 2 CH 2 —, or —SO 2 NH—; and Y is selected from:
 (i) —CH 2 F, —CH 2 Cl, —CH 2 CN, or —CH 2 NO 2 ; or 
 (ii) C 2-6  alkenyl substituted with oxo, NO 2 , or CN, and optionally substituted with halogen; or 
 (iii) C 2-6  alkynyl optionally substituted with oxo, halogen, NO 2 , or CN; or 
 (iv) a saturated 3-4 membered heterocyclic ring having 1 heteroatom selected from oxygen or nitrogen wherein said ring is substituted with 1-2 R e  groups; or 
 (v) a saturated 5-6 membered heterocyclic ring having 1-2 heteroatoms selected from oxygen or nitrogen wherein said ring is substituted with 1-4 R e  groups; or 
 (vii) a saturated 3-6 membered carbocyclic ring, wherein said ring is substituted with 1-4 R e  groups; or 
 (viii) a partially unsaturated 3-6 membered monocyclic ring having 0-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; or 
 (ix) a partially unsaturated 3-6 membered carbocyclic ring, wherein said ring is substituted with 1-4 R e  groups; or 
 (xi) a partially unsaturated 4-6 membered heterocyclic ring having 1-2 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; or 
 (xiii) a 6-membered aromatic ring having 0-2 nitrogens wherein said ring is substituted with 1-4 R e  groups; or 
 (xv) a 5-membered heteroaryl ring having 1-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-3 R e  groups; or 
 (xvii) an 8-10 membered bicyclic, saturated, partially unsaturated, or aryl ring having 0-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein said ring is substituted with 1-4 R e  groups; or 
 
 (q) -L-Y is selected from: 
 
 
       
         
           
           
               
               
           
         
         or
 (r) L is a bivalent C 2-8  straight or branched, hydrocarbon chain wherein L has at least one double bond and one or two methylene units of L are independently replaced by —NRC(O)—, —C(O)NR—, —N(R)SO 2 —, —SO 2 N(R)—, —S(O)—, —SO 2 —, —OC(O)—, —C(O)O—, cyclopropylene, —O—, —N(R)—, or —C(O)—; and 
 Y is hydrogen, C 1-6  aliphatic optionally substituted with oxo, halogen, NO 2 , or CN, or a 3-10 membered monocyclic or bicyclic, saturated, partially unsaturated, or aryl ring having 0-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, and wherein said ring is substituted with 1-4 R e  groups; or 
 (s) L is a bivalent C 2-8  straight or branched, hydrocarbon chain wherein L has at least one triple bond and one or two methylene units of L are optionally and independently replaced by —NRC(O)—, —C(O)NR—, —N(R)SO 2 —, —SO 2 N(R)—, —O—, —N(R)—, —C(O)—, —S—, —S(O)—, —SO 2 —, —OC(O)—, or —C(O)O—, and 
 Y is hydrogen, C 1-6  aliphatic optionally substituted with oxo, halogen, NO 2 , or CN, or a 3-10 membered monocyclic or bicyclic, saturated, partially unsaturated, or aryl ring having 0-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, and wherein said ring is substituted with 1-4 R e  groups; or 
 (t) L is a bivalent C 2-8  straight or branched, hydrocarbon chain wherein one methylene unit of L is replaced by cyclopropylene and one or two additional methylene units of L are independently replaced by —NRC(O)—, —C(O)NR—, —N(R)SO 2 —, —SO 2 N(R)—, —S—, —O—, —N(R)—, —C(O)—, —S(O)—, —SO 2 —, —OC(O)—, or —C(O)O—, and 
 Y is C 1-6  aliphatic substituted with oxo, halogen, NO 2 , or CN, or a 3-10 membered monocyclic or bicyclic, saturated, partially unsaturated, or aryl ring having 0-3 heteroatoms independently selected from nitrogen, oxygen, or sulfur, and wherein said ring is substituted with 1-4 R e  groups;
 each R e  is independently selected from -Q-Z, oxo, NO 2 , halogen, CN, a suitable leaving group selected from alkoxy, sulphonyloxy, optionally substituted alkylsulphonyloxy, optionally substituted alkenylsulfonyloxy, optionally substituted arylsulfonyloxy, acyl, and diazonium, or C 1-6  aliphatic substituted with oxo, halogen, NO 2 , or CN, wherein:
 Q is a bivalent C 2-6  unsaturated, straight or branched, hydrocarbon chain, wherein one or two methylene units of Q are optionally and independently replaced by —N(R)—, —S—, —O—, —C(O)—, —OC(O)—, —C(O)O—, —SO—, —SO 2 —, —N(R)C(O)—, —C(O)N(R)—, —N(R)SO 2 —, or —SO 2 N(R)—; and 
 each Z is independently hydrogen or C 1-6  aliphatic substituted with oxo, halogen, NO 2 , or CN, or: 
 
 R 3  and R 1  are taken together with their intervening atoms to form an optionally substituted 12-18 membered ring having 2-6 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein the ring formed thereby comprises the warhead group -L-Y; or 
 R 3  and a ring formed by R 1  and R 1′  are taken together with their intervening atoms to form an optionally substituted 12-18 membered ring having 2-6 heteroatoms independently selected from nitrogen, oxygen, or sulfur, wherein the ring formed thereby comprises the warhead group -L-Y; 
 
 
         R w  is hydrogen or an optionally substituted group selected from C 1-6  aliphatic, 6-10 membered aryl, 5-10 membered heteroaryl having 1-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur, or 4-7 membered heterocyclyl having 1-2 heteroatoms independently selected from nitrogen, oxygen, or sulfur: or
 R w  and R x  are taken together to form an optionally substituted C 3-7  membered ring having 0-2 heteroatoms independently selected from nitrogen, oxygen or sulfur, or: 
 R w  and R y  are taken together to form an optionally substituted C 3-7  membered ring having 0-2 heteroatoms independently selected from nitrogen, oxygen or sulfur; 
 
         R x  is -T-R z , wherein:
 T is a covalent bond or a C 1-6  bivalent hydrocarbon chain wherein one or two methylene units of T are optionally and independently replaced by —O—, —S—, —N(R)—, —N(R)C(O)—, —C(O)N(R)—, —S(O)—, —S(O) 2 —, —N(R)SO 2 —, or —SO 2 N(R)—; and 
 R z  is hydrogen or an optionally substituted group selected from a bridged bicyclic, or 5-10 membered monocyclic or bicyclic heteroaryl having 1-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur; 
 
         R x′  is hydrogen, or R x′  and R x  are taken together with their intervening atoms to form an optionally substituted spiro-fused 5-7 membered ring having 0-2 heteroatoms independently selected from nitrogen, oxygen, or sulfur; 
         R y  is hydrogen, or R x  and R y  are taken together to form an optionally substituted C 3-7  membered ring having 0-2 heteroatoms independently selected from nitrogen, oxygen or sulfur; 
         R 4  is H, —NHC(O)R 5 , —NHC(O)OR 6 , 
       
       
         
           
           
               
               
           
         
       
       or a natural or unnatural amino acid side-chain group;
 each R 5  is independently —N(R) 2  or an optionally substituted group selected from C 1-6  aliphatic, a bridged bicyclic, 6-10 membered aryl, 5-10 membered heteroaryl having 1-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur, or 4-7 membered heterocyclyl having 1-2 heteroatoms independently selected from nitrogen, oxygen, or sulfur; 
 R 6  is an optionally substituted group selected from C 1-6  aliphatic, a bridged bicyclic, 6-10 membered aryl, 5-10 membered heteroaryl having 1-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur, or 4-7 membered heterocyclyl having 1-2 heteroatoms independently selected from nitrogen, oxygen, or sulfur; and 
 R 7  is an optionally substituted group selected from C 1-6  aliphatic, a bridged bicyclic, 6-10 membered aryl, 5-10 membered heteroaryl having 1-4 heteroatoms independently selected from nitrogen, oxygen, or sulfur, or 4-7 membered heterocyclyl having 1-2 heteroatoms independently selected from nitrogen, oxygen, or sulfur. 
 
     
     
         66 . The method according to  claim 65 , wherein the HCV protease, or a mutant thereof, activity is inhibited irreversibly. 
     
     
         67 . The method according to  claim 66 , wherein the HCV protease, or a mutant thereof, activity is inhibited irreversibly by covalently modifying Cys159 or a cysteine residue conserved at an equivalent position to Cys159 of HCV protease subtype 1b. 
     
     
         68 . The method according to  claim 46 , wherein the step of administering occurs once daily. 
     
     
         69 . The method according to  claim 68 , wherein the disorder is hepatitis C. 
     
     
         70 . The method according to  claim 46 , comprising the step of irreversibly inhibiting HCV protease by covalently modifying Cys159 or a cysteine residue conserved at an equivalent position to Cys159 of HCV protease subtype 1b. 
     
     
         71 . The method according to  claim 70 , wherein the HCV protease genotype or subtype is selected from the group consisting of 1a, 1b, 1c, 2a, 2b, 2c, 2i, 2k, 3a, 3b, 3k, 4a, 4d, 4f, 5a, 6a, 6b, 6c, 6d, 6e, 6f, 6g, 6h, 6i, 6j, 6k, 6l, 6m, 6n, 6o, 6p, 6q, 6t, and 7a. 
     
     
         72 . The method according to  claim 71 , wherein the HCV protease genotype or subtype is 1a, 1b, 2a, or 3a.

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