Anti-viral compounds
View Patent ↗Compounds effective in inhibiting replication of Hepatitis C virus (“HCV”) or other viruses are disclosed. This invention is also directed to compositions comprising such compounds, co-formulation or co-administration of such compounds with other anti-viral or therapeutic agents, processes and intermediates for the syntheses of such compounds, and methods of using such compounds for the treatment of HCV or other viral infections.
1. A compound, a tautomer of the compound, or a pharmaceutically acceptable salt of the compound or tautomer, wherein the compound has Formula I(a),
wherein:
Z is —NR 41 —;
A is optionally substituted with one or more R 18 , wherein R 18 is independently selected at each occurrence from the group consisting of halogen, hydroxy, mercapto, nitro, cyano, amino, carboxy, formyl, azido, alkyl, alkenyl, alkynyl, -L S -O—R S , -L S -S—R S , -L S -C(O)R S , -L S -OC(O)R S , -L S -C(O)OR S , -L S -N(R S R S′ ), -L S -C(═NR S )R S′ ,-L S -S(O)R S , -L S -SO 2 R S , -L S -C(O)N(R S R S′ ), -L S -N(R S )C(O)R S′ , -L S -C(═NR S )N(R S′ R S″ ), -L S -N(R S′ )C(═NR S )R S″ , -L S -N(R S )C(O)N(R S′ R S″ ), -L S -N(R S )SO 2 R S′ , -L S -SO 2 N(R S R S′ ), and -L S -N(R S )SO 2 N(R S′ R S″ );
R 17 and R 41 are each independently selected at each occurrence from the group consisting of hydrogen, halogen, hydroxy, mercapto, nitro, cyano, amino, carboxy, formyl, azido, alkyl, alkenyl, alkynyl, carbocyclyl, heterocyclyl, -L S -O—R S , -L S -S—R S , -L S -C(O)R S , -L S -OC(O)R S , -L S -C(O)OR S , -L S -N(R S R S′ ), -L S -C(═NR S )R S′ , -L S -S(O)R S , -L S -SO 2 R S , -L S -C(O)N(R S R S′ ), -L S -N(R S )C(O)R S′ , -L S -C(═NR S )N(R S′ R S″ ), -L S -N(R S′ )C(═NR S )R S″ , -L S -N(R S )C(O)N(R S′ R S″ ), -L S -N(R S )SO 2 R S′ , -L S -SO 2 N(R S R S′ ), -L S -N(R S )SO 2 N(R S′ R S″ ), -L E -Q-L E′ -(C 3 -C 18 carbocyclyl) and -L E -Q-L E′ -(M 3 -M 18 heterocyclyl);
X is —O—or —S—
R 22 is phenyl, and is optionally substituted with one or more R 26 , wherein R 26 is independently selected at each occurrence from the group consisting of halogen, hydroxy, mercapto, nitro, cyano, amino, carboxy, formyl, azido, alkyl, alkenyl, alkynyl, -L S -O—R S , -L S -S—R S , -L S -C(O)R S , -L S -OC(O)R S , -L S -C(O)OR S , -L S -N(R S R S″ ), -L S -C(═NR S )R S″ , -L S -S(O)R S , -L S -SO 2 R S , -L S -OS(O)R S , -L S -OSO 2 R S , -L S -C(O)N(R S R S′ ), -L S -N(R S )C(O)R S′ , -L S -C(═NR S )N(R S′R S″ ), -L S -N(R S′ )C(═NR S )R S″ , -L S -N(R S )C(O)N(R S′ R S″ ), -L S -N═C(NR S R S′ )(NR S R S′ ), -L S -N(R S )SO 2 R S′ , -L S -SO 2 N(R S R S′ ), -L S -N(R S )SO 2 N(R S′ R S″ ), -L E -Q-L E′ -(C 3 -C 18 carbocyclyl) and -L E -Q-L E′ -(M 3 -M 18 heterocyclyl);
Y is selected from the group consisting of a bond, -L S -O—, -L S -C(O)—, -L S -S(O) 2 -L S -S(O)—, -L S -OS(O) 2 -, -L S -OS(O)—, -L S -C(O)O—, -L S -OC(O)—, -L S -OC(O)O—, -L S -C(O)N(R 15 )O—, -L S -N (R 15 )C(O)—, -L S -C(O)N(R 15 )O—, -L S -N(R 15 )C(O)O—, -L S -C(O)N(R 15 )N(R 15 ′)-, -L S -S-, -L S″ C(S)—, -L S -C(S)O—, -L S -OC(S)—, -L S -C(S)N(R 15 )—, -L S -N(R 15 )—, -L S -N(R 15 )C(S)—, -L S -N(R 15 )S(O)O—, -L S -N(R 15 )S(O) 2 -, -L S -S(O) 2 N(R 15 )—, -L S -S(O)N(R 15 )—, -L S -C(S)N(R 15 )O—, and -L S -C(S)N(R 15 )N(R 15 ′)-, wherein R 15 and R 15′ are each independently selected at each occurrence from the group consisting of hydrogen, alkyl, alkenyl and alkynyl;
R 50 is -L 1 -A 1 , wherein A 1 is selected from the group consisting of carbocyclyl and heterocyclyl, and L 1 is selected from the group consisting of a bond, alkylene, alkenylene and alkynylene, wherein A 1 is optionally substituted with one or more R 30 , and R 3 is independently selected at each occurrence from the group consisting of halogen, oxo, thioxo, hydroxy, mercapto, nitro, cyano, amino, carboxy, formyl, phosphate, azido, alkyl, alkenyl, alkynyl, -L S -O—R S , -L S -S—R S , -L S -C(O)R S , -L S -OC(O)R S , -L S -C(O)OR S , -L S -N(R S R S′ ), -L S -C(═NR S )R S′ , -L S -S(O)R S , -L S -SO 2 R S , -L S -C(O)N(R S R S′ ), -L S -N(R S )C(O)R S′ , -L S -C(═NR S )N(R S″, R S″ ), -L S -N(R S′ )C(═NR S )R S″ , -L S -N(R S )C(O)N(R S″, R S″ ), -L S -N(R S )SO 2 R S′ , -L S -SO 2 N(R S R S′ ), -L S -N(R S )SO 2 N(R S R S′ ), -L E′ -Q-L E′ (C 3 -C 18 carbocyclyl) and -L E -Q-L E′ -(M 3 -M 18 heterocyclyl), and wherein L 1 is optionally substituted with one or more R 38 , and R 38 is independently selected at each occurrence from the group consisting of halogen, oxo, thioxo, hydroxy, mercapto, nitro, cyano, amino, carboxy, formyl, phosphate, azido, alkoxy, thioalkoxy, alkylcarbonyl, alkoxycarbonyl, alkylcarbonyloxy, alkylamino, alkoxycarbonylamino, -L S -O—R S , -L S -S—R S , -L S -C(O)R S , -L S -OC(O)R S , -L S -C(O)OR S , -L S -N(R S R S′ ), -L S -C(═NR S )R S″ , -L S -S(O)R S , -L S -SO 2 R S , -L S -C(O)N(R S R S′ ), -L S -N(R S )C(O)R S′ , -L S -C(═NR S )N(R S′, R S″ ), -L S -N(R S′ )C(═NR S )R S″ , -L S -N(R S )C(O)N(R S′ R S″ ), -L S -N(R S )SO 2 R S′ , -L S -L S -SO 2 N(R S R S′ ), -L S -N(R S )SO 2 N(R S′ R S″ ), carbocyclyl, heterocyclyl, carbocyclylalkyl, heterocyclylalkyl, -L E -Q-L E′ -(C 3 -C 18 carbocyclyl) and -L E -Q-L E′ -(M 3 -M 18 heterocyclyl);
L S is independently selected at each occurrence from the group consisting of a bond, alkylene, alkenylene and alkynylene;
R S , R S′ , and R S″ are each independently selected at each occurrence from the group consisting of hydrogen, alkyl, alkenyl, alkynyl, alkoxy, thioalkoxy, alkoxyalkyl, alkoxyalkoxyalkyl, thioalkoxyalkyl, alkylcarbonyl, alkylcarbonylalkyl, alkoxycarbonyl, alkoxycarbonylalkyl, alkylcarbonyloxy, alkylcarbonyloxyalkyl, alkylamino, alkylaminoalkyl, alkoxycarbonylamino, and alkoxycarbonylaminoalkyl;
L E and L E′ , are each independently selected at each occurrence from the group consisting of a bond, alkylene, alkenylene, alkynylene, -alkylene-O-alkylene-, -alkylene-S-alkylene-, -alkylene-NC(O)-alkylene-, and -alkylene-C(O)N-alkylene-;
Q is independently selected at each occurrence from the group consisting of a bond, alkylene, alkenylene, alkynylene, —S—, —O—, —C(O)—, —N(R S )—, —N(R S )C(O)—, —C(O)N(R S )—, —N(R S )C(O)O—, —OC(O)N(R S )—, —N(R S )C(O)N(R S′ )—, —C(═NR S )N(R S′ )—, —N(R S ′ )C(═NR S )—, —S(O)—, —SO 2 —, —O—SO 2 —, —SO 2 —O—, —O—S(O)—, —S(O)—O—, —C(O)O— and —OC(O)—;
R 15 , R 15 ′, R 17 , R 18 , R 26 , R 30 , R 38 , and R 41 are each independently optionally substituted at each occurrence with at least one substituent selected from the group consisting of halogen, oxo, thioxo, hydroxy, mercapto, nitro, cyano, amino, carboxy, formyl, phosphate, alkoxy, alkylamino, alkoxycarbonyl, and azido; and
each C 3 -C 18 carbocyclyl and M 3 -M 18 heterocycly1 moiety in -L E -Q-L E′ -(C 3 -C 18 carbocyclyl) and -L E -Q-L E′ -(M 3 -M 18 heterocyclyl) is independently optionally substituted at each occurrence with at least one substituent selected from the group consisting of hydrogen, halogen, oxo, thioxo, hydroxy, mercapto, nitro, cyano, amino, carboxy, formyl, phosphate, azido, alkyl, alkenyl, alkynyl, alkoxy, thioalkoxy, alkoxyalkyl, thioalkoxyalkyl, alkylcarbonyl, alkylcarbonylalkyl, alkoxycarbonyl, alkoxycarbonylalkyl, alkylcarbonyloxy, alkylcarbonyloxyalkyl, alkylamino, alkylaminoalkyl, alkoxycarbonylamino, carbocyclyloxy, heterocyclyloxy, carbocycloalkoxy, heterocycloalkoxy, carbocycloalkoxycarbonyl, heterocycloalkoxycarbonyl, and alkoxycarbonylaminoalkyl.
2. The compound, tautomer, or salt of claim 1 , wherein:
A is optionally substituted with one or more R 18 , wherein R 18 is independently selected at each occurrence from the group consisting of halogen, hydroxy, mercapto, nitro, cyano, amino, carboxy, formyl, azido, C 1 -C 6 alkyl, C 2 -C 6 alkenyl, C 2 -C 6 alkynyl, -L S -O—R S , -L S -S—R S , -L S -C(O)R S , -L S -OC(O)R S , -L S -C(O)OR S , -L S -N(R S R S′ ), -L S -C(═NR S )R S′ , -L S -S(O)R S , -L S -SO 2 R S , -L S -C(O)N(R S R S′ ), -L S -N(R S )C(O)R S′ , -L S -C(═NR S )N(R S″, R S″ ), -L S -N(R S′ )C(═NR S )R S″ , -L S -N(R S )C(O)N(R S R S″ ), -L S -N(R S )SO 2 R S′ , -L S -SO 2 N(R S R S′ ), and -L S -N(R S )SO 2 N(R S′ R S″ );
R 17 and R 41 are each independently selected at each occurrence from the group consisting of hydrogen, halogen, hydroxy, mercapto, nitro, cyano, amino, carboxy, formyl, azido, C 1 -C 6 alkyl, C 2 -C 6 alkenyl, C 2 -C 6 alkynyl, C 3 -C 6 carbocyclyl, M 3 -M 6 heterocyclyl, -L S -O—R S , -L S -S—R S , -L S -C(O)R S , -L S -OC(O)R S , -L S -C(O)OR S , -L S -N(R S R S′ ), -L S -C(═NR S )R S′ , -L S -S(O)R S , -L S -SO 2 R S , -L S -C(O)N(R S R S′ ), -L S -N(R S )C(O)R S′ , -L S -C(═NR S )N(R S R S″ ), -L S -N(R S′ )C(═NR S )R S″ , -L S -N(R S )C(O)N(R S″, R S″ ), -L S -N(R S )SO 2 R S′ , -L S -SO 2 N(R S R S′ ), -L S -N(R S )SO 2 N(R S′ R S″ ), -L E -Q-L E′ -(C 3 -C 18 carbocyclyl) and -L E -Q-L E′ -(M 3 -M 18 heterocyclyl);
R 22 is phenyl and is optionally substituted with one or more R 26 , wherein R 26 is independently selected at each occurrence from the group consisting of halogen, hydroxy, mercapto, nitro, cyano, amino, carboxy, formyl, azido, C 1 -C 6 alkyl, C 2 -C 6 alkenyl, C 2 -C 6 alkynyl, L S″ -O—R S , -L S -S—R S , -L S -C(O)R S , -L S -OC(O)R S , -L S -C(O)OR S , -L S -N(R S R S′ ), -L S -C(═NR S )R S′ , -L S -S(O)R S , -L S -SO 2 R S , -L S -OS(O)R S , -L S -OSO 2 R S , -L S -C(O)N(R S R S′ ), -L S -N(R S )C(O)R S′ , -L S -C(═NR S )N(R S′ , R S″ ), -L S -N(R S′ )C(═NR S )R S″ , -L S -N(R S )C(O)N(R S R S″ ), -L S -N═C(NR S R S′ )(NR S R S′ ), -L S -N(R S )SO 2 R S′ , -L S -SO 2 N(R S R S′ ), -L S -N(R S )SO 2 N(R S′ R S″ ), -L E -Q -L E′ -(C 3 -C l8 carbocyclyl) and -L E -Q-L E′ -(M 3 -M 18 heterocyclyl);
Y is selected from the group consisting of a bond, -L S -O—, -L S -C(O)—, -L S -S(O) 2 -, -L S -S(O)—, -L S -OS(O) 2 -, -L S -OS(O)—, -L S -C(O)O—, L S -OC(O)—, -L S -OC(O)O—, -L S -C(O)N(R 15 )—, -L S -N(R 15 )C(O)—, -L S -C(O)N(R 15 )O—, -L S -N(R 15 )C(O)O—, L S -C(O)N(R 15 )N(R 15 ′)-, -L S -S—, L S -C(S)—, -L S -C(S)O—, -L S -OC(S)—, -L S -C(S)N(R 15 )—, -L S -N(R 15 )—, -L S -N(R 15 )C(S)—, -L S -N(R 15 )S(O)—, -L S -N(R 15 )S(O) 2 —, -L S -S(O) 2 N(R 15 )—, -L S -S(O)N(R 15 )—, -L S -C(S)N(R 15 )O—, and -L S -C(S)N(R 15 )N(R 15 ′)-, wherein R 15 and R 15 ′ are each independently selected at each occurrence from the group consisting of hydrogenC 1 -C 6 alkyl, C 2 -C 6 alkenyl and C 2 -C 6 alkynyl;
R 50 is -L 1 -A 1 , wherein A 1 is selected from the group consisting of carbocyclyl and heterocyclyl, and L 1 is selected from the group consisting of a bond, C 1 -C 6 alkylene, C 2 -C 6 alkenylene and C 2 -C 6 alkynylene, wherein A 1 is optionally substituted with one or more R 30 , and R 3 is independently selected at each occurrence from the group consisting of halogen, oxo, thioxo, hydroxy, mercapto, nitro, cyano, amino, carboxy, formyl, phosphate, azido, C 1 -C 6 alkyl, C 2 -C 6 alkenyl, C 2 -C 6 alkynyl, -L S -O—R S , -L S -S—R S , -L S -C(O)R S , -L S -OC(O)R S , -L S -C(O)OR S , L S N(R S R S″ ), -L S -C(═NR S )R S′ , -L S -S(O)R S , -L S -SO 2 R S , -L S -C(O)N(R S R S′ ), -L S -N(R S )C(O)R S′ , -L S -C(═NR S )N(R S′ R S″ ), -L S -N(R S′ )C(═NR S )R S″ , -L S -N(R S )C(O)N(R S R S″ ), -L S -N(R S )SO 2 R S′ , L S -SO 2 N(R S R S′ ), -L S -N(R S )SO 2 N(R S′ R S″ ), -L E -Q-L E′ -(C 3 -C 18 carbocyclyl) and -L E -Q-L E′ -(M 3 -M 18 heterocyclyl), and wherein L 1 is optionally substituted with one or more R 38 , and R 38 is independently selected at each occurrence from the group consisting of halogen, oxo, thioxo, hydroxy, mercapto, nitro, cyano, amino, carboxy, formyl, phosphate, azido, C 1 -C 6 alkoxy, C 1 -C 6 thioalkoxy, C 1 -C 6 alkylcarbonyl, C 1 -C 6 alkoxycarbonyl, C 1 -C 6 alkylcarbonyloxy, C 1 -C 6 alkylamino, C 1 -C 6 alkoxycarbonylamino, -L S -O—R S , -L S -S—R S , -L S -C(O)R S , -L S -OC(O)R S , -L S -C(O)OR S , -L S -N(R S R S′ ), -L S -C(═NR S )R S′ , -L S -S(O)R S , -L S -SO 2 R S , -L S -C(O)N(R S R S′ ), -L S -N(R S )C(O)R S′ , -L S -C(═NR S )N(R S′ R S″ ), -L S -N(R S′ )C(═NR S )S S″ , -L S -N(R S )C(O)N(R S′ R S″ ), -L S -N(R S )SO 2 R S′ , -L S -SO 2 N(R S R S′ ), -L S -N(R S )SO 2 N(R S′ R S″ ), carbocyclyl, heterocyclyl, carbocyclylC 1 -C 6 alkyl, heterocyclylC 1 -C 6 alkyl, -L E -Q-L E′ -(C 3 -C 18 carbocyclyl) and -L E -Q-L E -(M 3 -M 18 heterocyclyl);
L S is independently selected at each occurrence from the group consisting of a bond, C 1 -C 6 alkylene, C 2 -C 6 alkenylene and C 2 -C 6 alkynylene;
R S , R S′ , and R S″ are each independently selected at each occurrence from the group consisting of hydrogen, C 1 -C 6 alkyl, C 2 -C 6 alkenyl, C 2 -C 6 alkynyl, C 1 -C 6 alkoxy, C 1 -C 6 thioalkoxy, C 1 -C 6 alkoxyC 1 -C 6 alkyl, C 1 -C 6 alkoxyC 1 -C 6 alkoxyC 1 -C 6 alkyl, C 1 -C 6 thioalkoxyC 1 -C 6 alkyl, C 1 -C 6 alkylcarbonyl, C 1 -C 6 alkylcarbonyl C 1 -C 6 alkyl, C 1 -C 6 alkoxycarbonyl, C 1 -C 6 alkoxycarbony1C 1 -C 6 alkyl, C 1 -C 6 alkylcarbonyloxy, C 1 -C 6 alkylcarbonyloxy C 1 -C 6 alkyl, C 1 -C 6 alkylamino, C 1 -C 6 alkylaminoC 1 -C 6 alkyl, C 1 -C 6 alkoxycarbonylamino, and C 1 -C 6 alkoxycarbonylaminoC 1 -C 6 alkyl;
L E and L E′ , are each independently selected at each occurrence from the group consisting of a bond, C 1 -C 6 alkylene, C 2 -C 6 alkenylene and C 2 -C 6 alkynylene, —C 1 -C 6 alkylene-O—C 1 -C 6 alkylene-, —C 1 -C 6 alkylene-S—C 1 -C 6 alkylene-, —C 1 -C 6 alkylene-NC(O)—C 1 -C 6 alkylene-, and —C 1 -C 6 alkylene-C(O)N—C 1 -C 6 alkylene-;
Q is independently selected at each occurrence from the group consisting of a bond, C 1 -C 6 alkylene, C 2 -C 6 alkenylene, C 2 -C 6 alkynylene, —S—, —O—, —C(O)—, —N(R S )—, —N(R S )C(O)—,—C(O)N(R S ), -,-N(R S )C(O)O—, —O—C(O)N(R S )—, —N(R S )C(O)N(R S′ )—, —C(═NR S )N(R S′ )-, —N(R S′ )C(═NR S )—, —S(O)—, —SO 2 —, —O—SO 2 —, —SO 2 —O—, —O—S(O)—, —S(O)—O—, —C(O)O— and —OC(O)—;
R 15 , R 15′ , R 17 , R 18 , R 26 , R 30 , R 38 , and R 41 are each independently optionally substituted at each occurrence with at least one substituent selected from the group consisting of halogen, oxo, thioxo, hydroxy, mercapto, nitro, cyano, amino, carboxy, formyl, phosphate, C 1 -C 6 alkoxy, C 1 -C 6 alkylamino, C 1 -C 6 alkoxycarbonyl, and azido; and
each C 3 -C 18 carbocycly1 and M 3 -M 18 heterocyclyl moiety in -L E -Q-L E′ -(C 3 -C 18 carbocyclyl) and -L E -Q-L E′ -(M 3 -M 18 heterocyclyl) is independently optionally substituted at each occurrence with at least one substituent selected from the group consisting of hydrogen, halogen, oxo, thioxo, hydroxy, mercapto, nitro, cyano, amino, carboxy, formyl, phosphate, azido, C 1 -C 6 alkyl, C 2 -C 6 alkenyl, C 2 -C 6 alkynyl, C 1 -C 6 alkoxy, C 1 -C 6 thioalkoxy, C 1 -C 6 alkoxy, C 1 -C 6 alkyl, C 1 -C 6 thioalkoxy, C 1 -C 6 alkyl, C 1 -C 6 alkylcarbonyl, C 1 -C 6 alkylcarbonyl, C 1 -C 6 alkyl, C 1 -C 6 alkoxycarbonyl, C 1 -C 6 alkoxycarbonyl, C 1 -C 6 alkyl, C 1 -C 6 alkylcarbonyloxy, C 1 -C 6 alkylcarbonyloxy, C 1 -C 6 alkyl, C 1 -C 6 alkylamino, C 1 -C 6 alkylamino, C 1 -C 6 alkyl, C 1 -C 6 alkoxycarbonylamino, C 3 -C 7 carbocyclyloxy, M 3 -M 7 heterocyclyloxy, C 3 -C 7 carbocycloC 1 -C 6 alkoxy, M 3 -M 7 heterocycloC 1 -C 6 alkoxy, C 3 -C 7 carbocyclo, C 1 -C 6 alkoxycarbonyl, M 3 -M 7 heterocycloC 1 -C 6 alkoxycarbonyl, and C 1 -C 6 alkoxycarbonylaminoC 1 -C 6 alkyl.
3. The compound, tautomer, or salt of claim 2 , wherein R 41 is hydrogen, C 1 -C 6 alkyl, C 2 -C 6 alkenyl or C 2 -C 6 alkynyl.
4. The compound, tautomer, or salt of claim 3 , wherein Y is -L S -O—, -L S -S—, L S -C(O)N(R 15 )— or -L S -N(R 15 )C(O)—, R 15 is hydrogen, C 1 -C 6 alkyl, C 2 -C 6 alkenyl or C 2 -C 6 alkynyl, and L 1 is C 1 -C 6 alkylene optionally substituted with one or more R 38 , and wherein A 1 is a C 4 -C 6 carbocyclyl or M 4 -M 6 heterocyclyl and is optionally substituted with one or more R 30 .
5. The compound, tautomer, or salt of claim 3 , wherein Y is -L S -O—, -L S -S—, -L S -C(O)N(R 15 )— or -L S -N(R 15 )C(O)—, R 15 is hydrogen, C 1 -C 6 alkyl, C 2 -C 6 alkenyl or C 2 -C 6 alkynyl, and L 1 is a bond, wherein A 1 is a C 4 -C 6 carbocyclyl or M 4 -M 6 heterocyclyl and is optionally substituted with one or more R 30 .
6. The compound, tautomer, or salt of claim 3 , wherein Y is -L S -O—, -L S -S—, L S -C(O)N(R 15 )— or -L S -N(R 15 )C(O)—, R 15 is hydrogen, C 1 -C 6 alkyl, C 2 -C 6 alkenyl or C 2 -C 6 alkynyl, and L 1 is a bond or C 1 -C 6 alkylene optionally substituted with one or more R 38 , wherein A 1 is a bicyclic ring (e.g., a fused bicyclic ring or a bridged bicyclic ring) which has from 6 to 14 ring atoms and is optionally substituted with one or more R 30 .
7. The compound, tautomer, or salt of claim 3 , wherein R 22 is
wherein R 48 is hydroxy, amino, C 1 -C 6 alkylamino, C 1 -C 6 alkoxy, C 1 -C 6 alkoxycarbonylamino or C 1 -C 6 alkylcarbonyloxy, and wherein R 22 is optionally substituted with one or more R 26 .
8. A pharmaceutical composition comprising a compound, tautomer or salt according to claim 1 .