Compositions and methods for inhibition of the JAK pathway

1. A compound of formula IA:

or salt thereof, wherein:

R 1 is H, optionally substituted C 1-6 alkyl, C(O)—C 1-6 alkyl, CO 2 —C 1-6 alkyl or R 50 ;

each R 50 is —C(R 9 ) 2 -A-R 10 , where A is O or S; each R 9 is independently for each occurrence H, optionally substituted C 1-6 alkyl, optionally substituted C 6-10 aryl or optionally substituted C 7-16 arylalkyl; or alternatively, two R 9 , together with the carbon to which they are attached, form an optionally substituted C 3-8 cycloalkyl group or an optionally substituted 3-8 membered heteroalicyclyl; R 10 is R a , —P(O)(OR 11 ) 2 , —P(O)(OR 11 )N(R 12 ) 2 or —P(O)(N(R 12 ) 2 ) 2 ; each R 11 is independently for each occurrence R a or a monovalent cationic group; or two R 11 , together with the atoms to which they are attached, form a 4-8 membered cyclic phosphate group; each R 12 is independently for each occurrence R c or —C 1-3 alkyl-N(R c ) 2 ; or two R 12 , each on separate nitrogens of —P(O)(N(R 12 ) 2 ) 2 , together with the atoms to which they are attached, form a 4-8 membered cyclic phosphonic acid bisamide group; or one R 12 along with R 11 , of the group —P(O)(OR 11 )N(R 12 ) 2 , together with the atoms to which they are attached, form a 4-8 membered cyclic phosphonamidate group;

each of R 2a-2c is independently for each occurrence H, R e , R b , R e substituted with one or more of the same or different R a and/or R b , —OR e substituted with one or more of the same or different R a and/or R b , —SR e substituted with one or more of the same or different R a and/or R b , —C(O)R e substituted with one or more of the same or different R a and/or R b , —N(R a )R e where R e is substituted with one or more of the same or different R a and/or R b , —S(O) 2 R e substituted with one or more of the same or different R a and/or R b , —N(R a )—S(O) 2 R e where R e is substituted with one or more of the same or different R a and/or R b , —B(OR a ) 2 , —B(N(R c ) 2 ) 2 , —(C(R a ) 2 ) m —R b , —O—(C(R a ) 2 ) m —R b , —S—(C(R a ) 2 ) m —R b , —O—(C(R b ) 2 ) m —R a , —N(R a )—(C(R a ) 2 ) m —R b , —O—(CH 2 ) m —CH((CH 2 ) m R b )R b , —C(O)N(R a )—(C(R a ) 2 ) m —R b , —O—(C(R a ) 2 ) m —C(O)N(R a )—(C(R a ) 2 ) m —R b , —N((C(R a ) 2 ) m R b ) 2 , —S—(C(R a ) 2 ) m —C(O)N(R a )—(C(R a ) 2 ) m —R b , —N(R a )—C(O)—N(R a )—(C(R a ) 2 ) m —R b , —N(R a )—C(O)—(C(R a ) 2 ) m —C(R a )(R b ) 2 or —N(R a )—(C(R a ) 2 ) m —C(O)—N(R a )—(C(R a ) 2 ) m —R b ;

R 2d is F;

R 2e is halo or optionally substituted C 1-6 alkyl;

each R a is independently for each occurrence H, deuterium, C 1-6 alkyl, C 3-8 cycloalkyl, C 4-11 cycloalkylalkyl, C 6-10 aryl, C 7-16 arylalkyl, 2-6 membered heteroalkyl, 3-10 membered heteroalicyclyl, 4-11 membered heteroalicyclylalkyl, 5-15 membered heteroaryl or 6-16 membered heteroarylalkyl;

each R b is independently for each occurrence ═O, —OR a , —O—(C(R a ) 2 ) m —OR a , haloC 1-3 alkyloxy, ═S, —SR a , ═NR a , ═NOR a , —N(R c ) 2 , halo, —CF 3 , —CN, —NC, —OCN, —SCN, —NO, —NO 2 , ═N 2 , —N 3 , —S(O)R a , —S(O) 2 R a , —SO 3 R a , —S(O)N(R c ) 2 , —S(O) 2 N(R c ) 2 , —OS(O)R a , —OS(O) 2 R a , —OSO 3 R a , —OS(O) 2 N(R c ) 2 , —C(O)R a , —CO 2 R a , —C(O)N(R c ) 2 , —C(NR a )—N(R c ) 2 , —C(NOH)—R a , —C(NOH)—N(R c ) 2 , —OC(O)R a , —OC(O)OR a , —OC(O)N(R c ) 2 , —OC(NH)—N(R c ) 2 , —OC(NR a )—N(R c ) 2 , —N(R a )—S(O) 2 H, —[N(R a )C(O)] n R a , —[N(R a )C(O)] n OR a , —[N(R a )C(O)] n N(R c ) 2 or —[N(R a )C(NR a )] n —N(R c ) 2 ;

each R c is independently for each occurrence R a , or, alternatively, two R c are taken together with the nitrogen atom to which they are bonded to form a 3 to 10-membered heteroalicyclyl or a 5-10 membered heteroaryl optionally comprising one or more of the same or different additional heteroatoms and which is optionally substituted with one or more of the same or different R a and/or R d groups;

each R d is ═O, —OR a , haloC 1-3 alkyloxy, C 1-6 alkyl, ═S, —SR a , ═NR a , ═NOR a , —N(R a ) 2 , halo, —CF 3 , —CN, —NC, —OCN, —SCN, —NO, —NO 2 , ═N 2 , —N 3 , —S(O)R a , —S(O 2 )R a , —SO 3 R a , —S(O)N(R a ) 2 , —S(O) 2 N(R a ) 2 , —OS(O)R a , —OS(O) 2 R a , —OSO 3 R a , —OS(O) 2 N(R a ) 2 , —C(O)R a , —CO 2 R a , —C(O)N(R a ) 2 , —C(NR a )N(R a ) 2 , —C(NOH)R a , —C(NOH)N(R a ) 2 , —OCO 2 R a , —OC(O)N(R a ) 2 , —OC(NR a )N(R a ) 2 , —[N(R a )C(O)] n R a , —(C(R a ) 2 ) n —OR a , —N(R a )—S(O) 2 R a , —C(O)—C 1-6 haloalkyl, —S(O) 2 C 1-6 haloalkyl, —OC(O)R a , —O(C(R a ) 2 ) m —OR a , —S(C(R a ) 2 ) m —OR a , —N(R a )C 1-6 haloalkyl, —P(O)(OR a ) 2 , —N(R a )—(C(R a ) 2 ) m —OR a , —[N(R a )C(O)] n OR a , —[N(R a )C(O)] n N(R a ) 2 , —[N(R a )C(NR a )] n N(R a ) 2 or —N(R a )C(O)C 1-6 haloalkyl;

two R d , taken together with the atom or atoms to which they are attached, combine to form a 3-10 membered partially or fully saturated mono or bicyclic ring, optionally containing one or more heteroatoms and optionally substituted with one or more R a ;

each R e is independently for each occurrence C 1-6 alkyl, C 3-8 cycloalkyl, C 4-11 cycloalkylalkyl, C 6-10 aryl, C 7-16 arylalkyl, 2-6 membered heteroalkyl, 3-10 membered heteroalicyclyl, 4-11 membered heteroalicyclylalkyl, 5-15 membered heteroaryl or 6-16 membered heteroarylalkyl;

each m is 1, 2 or 3;

each n is 0, 1, 2 or 3;

two of R 2a-2c groups, taken together with the atom or atoms to which they are attached, combine to form a 4-10 membered partially or fully saturated mono or bicyclic ring, optionally containing one or more heteroatoms and optionally substituted with one or more R a and/or R b ;

R 4 is H or optionally substituted C 1-6 alkyl; and

R 5 is H, halo, —CN, optionally substituted C 1-6 alkyl, nitro, —N(R a ) 2 , —C(O)N(R a ) 2 , —CO 2 R a or —C(O)R a .

2. The compound of claim 1 , wherein R 2a is H; R 2b is C 1-3 alkyl; and R 2c is —OC 1-3 alkyl.

3. The compound of claim 2 , wherein R 2a is H; R 2b is CH 3 ; and R 2c is —OCH 3 .

4. The compound of claim 1 , wherein R 2a is H; R 2b is —OC 1-3 alkyl; and R 2c is —OC 1-3 alkyl.

5. The compound of claim 4 , wherein R 2a is H; R 2b is —OC 1-3 alkyl; and R 2c is —OC 1-3 alkyl.

6. The compound of claim 5 , wherein R 2a is H; R 2b is —OCH 3 ; and R 2c is —OCH 3 .

7. The compound of claim 1 , wherein R 2a , R 2b and R 2c are each independently CH 3 , —OCH 3 , or F.

8. The compound of claim 7 , wherein two of R 2a , R 2b and R 2c are CH 3 ; and the other of R 2a , R 2b and R 2c is F.

9. The compound of claim 7 , wherein two of R 2a , R 2b and R 2c are CH 3 ; and the other of R 2a , R 2b and R 2c is —OCH 3 .

10. The compound of claim 7 , wherein two of R 2a , R 2b and R 2c are —OCH 3 ; and the other of R 2a , R 2b and R 2c is F.

11. The compound of claim 7 , wherein two of R 2a , R 2b and R 2c are —OCH 3 ; and the other of R 2a , R 2b and R 2c is CH 3 .

12. The compound of claim 7 , wherein one of R 2a , R 2b and R 2c is CH 3 ; one of R 2a , R 2b and R 2c is —OCH 3 ; and one of R 2a , R 2b and R 2c is F.