ARYL ALKYNAMIDE DERIVATIVES

1 . A compound of formula (I) or a salt thereof:

wherein,

Ring A is phenyl which may be optionally fused with 5-membered heterocyclyl, 6-membered heteroaryl containing one or two nitrogen atoms, pyrazolyl or 6-membered saturated or partially unsaturated heterocyclyl,

Ring B is phenyl which may be optionally fused with phenyl or 6-membered heteroaryl containing one or two nitrogen atoms, 6-membered heteroaryl containing one or two nitrogen atoms, pyrazolyl or imidazolyl,

R a1 and R a2 are independently H, C 1-6 alkyl, —O—C 1-6 alkyl, —O—C 1-6 alkylene-C 2-6 alkenyl, —O—C 1-6 alkylene-C 2-6 alkynyl, halogen, halogeno-C 1-6 alkyl, —O-halogeno-C 1-6 alkyl or —OH,

R b1 and R b2 are independently H, C 1-6 alkyl, —O—C 1-6 alkyl, halogeno-C 1-6 alkyl, —O-halogeno-C 1-6 alkyl, halogen, —C 1-6 alkylene-OH, —C 1-6 alkylene-NR c R d , —C(═O)—NR c R d , —NR c R d , —CN or —OH,

R c and R d are independently H, C 1-6 alkyl, C 3-8 cycloalkyl, —C(═O)—C 1-6 alkyl, or —S(═O) 2 —C 1-6 alkyl,

or, R c and R d may be optionally linked to each other to form 4- to 7-membered saturated heterocyclyl together with the nitrogen atom to which R c and R d are attached, wherein the heterocyclyl may be optionally substituted with one or two R e ,

R e is C 1-6 alkyl, —O—C 1-6 alkyl or halogen,

R 1 is H, optionally substituted C 1-6 alkyl, optionally substituted C 3-8 cycloalkyl, optionally substituted 4- to 7-membered saturated heterocyclyl, optionally substituted phenyl or optionally substituted heteroaryl,

R 2 is C 1-6 alkyl which is substituted with one or two R 3 , C 3-8 cycloalkyl which is substituted with one or two R 4 , 4- to 7-membered saturated heterocyclyl which is substituted with one or two R 5 , or phenyl which is substituted with one or two R 6 ,

or, R 1 and R 2 are linked to each other to form 4- to 7-membered saturated heterocyclyl together with the nitrogen atom to which R 1 and R 2 are attached, wherein the heterocyclyl may be optionally fused with phenyl, and the heterocyclyl and/or the fused phenyl may be optionally substituted with one to three R 7 ,

each R 3 is independently —OH, —O—C 1-6 alkyl, —C(═O)—NH 2 , —C(═O)—NH—C 1-6 alkyl, —C(═O)—N(C 1-6 alkyl) 2 , —NH 2 , —NH—C 1-6 alkyl, —N(C 1-6 alkyl) 2 , —NH—C(═O)—C 1-6 alkyl, —NH—S(═O) 2 —C 1-6 alkyl, —NH—S(═O) 2 —C 1-6 alkylene-OH, —NH—S(═O) 2 —C 1-6 alkylene-C(═O)—OH, —S(═O) 2 —NH 2 , —S(═O) 2 —C 1-6 alkyl or —S(═O)(═NH)—C 1-6 alkyl,

each R 4 is independently —OH, —O—C 1-6 alkyl, —C(═O)—NH 2 , —C(═O)—NH—C 1-6 alkyl, —C(═O)—N(C 1-6 alkyl) 2 , —NH 2 , —NH—C 1-6 alkyl, —N(C 1-6 alkyl) 2 , —NH—C(═O)—C 1-6 alkyl, —NH—S(═O) 2 —C 1-6 alkyl, —S(═O) 2 —NH 2 , —S(═O) 2 —C 1-6 alkyl or —S(═O)(═NH)—C 1-6 alkyl,

each R 5 is independently —OH, oxo or imino,

each R 6 is independently —C(═O)—OH, —S(═O) 2 —NH 2 , —S(═O) 2 —C 1-6 alkyl, —S(═O)(═NH)—C 1-6 alkyl or —NH—S(═O) 2 —C 1-6 alkyl, and

each R 7 is independently C 1-6 alkyl, —C 1-6 alkylene-OH, —C 1-6 alkylene-C(═O)—OH, C 3-8 cycloalkyl, —OH, —O—C 1-6 alkyl, —NH 2 , —NH—C 1-6 alkyl, —N(C 1-6 alkyl) 2 , —NH—C(═O)—C 1-6 alkyl, —NH—S(═O) 2 —C 1-6 alkyl, —S(═O) 2 —C 1-6 alkyl, —S(═O)(═NH)—C 1-6 alkyl, —C(═O)—OH, —C(═O)—NH 2 , —C(═O)—NH—C 1-6 alkyl, —C(═O)—N(C 1-6 alkyl) 2 , oxo, imino or 4- to 7-membered saturated heterocyclyl which may be optionally substituted with one or two oxo,

provided that the compound of formula (I) is not the compound of formula (II), (III), (IV) or (IVa);

2 . The compound or a salt thereof according to claim 1 ,

wherein,

Ring B is phenyl, 6-membered heteroaryl containing one or two nitrogen atoms or pyrazolyl,

R a1 and R a2 are independently H, C 1-6 alkyl, halogen, halogeno-C 1-6 alkyl or —O-halogeno-C 1-6 alkyl,

R b1 and R b2 are independently H, halogeno-C 1-6 alkyl or —C 1-6 alkylene-NR c R d ,

R c and R d are independently H or C 1-6 alkyl,

or, R c and R d may be optionally linked to each other to form 4- to 7-membered saturated heterocyclyl together with the nitrogen atom to which R c and R d are attached, wherein the heterocyclyl may be optionally substituted with one or two R e ,

R 1 is H, C 1-6 alkyl, C 3-8 cycloalkyl, 4- to 7-membered saturated heterocyclyl, optionally substituted phenyl or optionally substituted heteroaryl,

R 2 is C 1-6 alkyl which is substituted with one or two R 3 , C 3-8 cycloalkyl which is substituted with one or two R 4 , 4- to 7-membered saturated heterocyclyl which is substituted with one or two R 5 , or phenyl which is substituted with one or two R 6 ,

or, R 1 and R 2 are linked to each other to form 4- to 7-membered saturated heterocyclyl together with the nitrogen atom to which R 1 and R 2 are attached, wherein the heterocyclyl may be optionally fused with phenyl, and the heterocyclyl and/or the fused phenyl may be optionally substituted with one or two R 7 ,

each R 3 is independently —OH, —C(═O)—NH 2 , —NH—C(═O)—C 1-6 alkyl, —NH—S(═O) 2 —C 1-6 alkyl or —S(═O) 2 —NH 2 ,

each R 4 is independently —OH, —C(═O)—NH 2 , —NH—C(═O)—C 1-6 alkyl, —NH—S(═O) 2 —C 1-6 alkyl or —S(═O) 2 —NH 2 ,

each R 5 is independently —OH or oxo,

each R 6 is independently —C(═O)—OH or —S(═O) 2 —NH 2 , and

each R 7 is independently C 1-6 alkyl, —C 1-6 alkylene-OH, —C 1-6 alkylene-C(═O)—OH, C 3-8 cycloalkyl, —OH, —NH 2 , —C(═O)—OH, —C(═O)—NH 2 , oxo, imino or 4- to 7-membered saturated heterocyclyl which may be optionally substituted with one or two oxo.

3 . The compound or a salt thereof according to claim 2 ,

wherein,

Ring A is phenyl, 6-membered heteroaryl containing one or two nitrogen atoms, pyrazolyl or 6-membered saturated or partially unsaturated heterocyclyl,

Ring B is the formula (V):

X is CH or N,

R 1 is H, C 1-6 alkyl, C 3-8 cycloalkyl, 4- to 7-membered saturated heterocyclyl, phenyl or optionally substituted heteroaryl,

R 2 is C 1-6 alkyl which is substituted with one or two R 3 , C 3-8 cycloalkyl which is substituted with one or two R 4 , or 4- to 7-membered saturated heterocyclyl which is substituted with one or two R 5 ,

or, R 1 and R 2 are linked to each other to form 4- to 7-membered saturated heterocyclyl together with the nitrogen atom to which R 1 and R 2 are attached, wherein the heterocyclyl may be optionally substituted with one or two R 7 ,

R 4 is —OH,

provided that at least one of R a1 , R a2 , R b1 or R b2 are not H.

4 . The compound or a salt thereof according to claim 3 ,

wherein,

R b1 is H,

R b2 is halogeno-C 1-6 alkyl, and

R 1 and R 2 are linked to each other to form 4- to 7-membered saturated heterocyclyl together with the nitrogen atom to which R 1 and R 2 are attached, wherein the heterocyclyl may be optionally substituted with one or two R 7 .

5 .- 6 . (canceled)

7 . A pharmaceutical composition comprising the compound or a salt thereof according to claim 1 and one or more pharmaceutically acceptable excipients.

8 .- 12 . (canceled)

13 . A method for treatment of an autoimmune disease, a neurodegenerative disease, a type I interferonopathy and/or other STING-mediated disease comprising administering to a subject an effective amount of the compound or a salt thereof according to claim 1 .

14 . (canceled)

15 . The compound or a salt thereof according to claim 1 , wherein the compound is:

16 . A pharmaceutical composition comprising the compound or a salt thereof according to claim 15 and one or more pharmaceutically acceptable excipients.

17 . A method for treatment of an autoimmune disease, a neurodegenerative disease, a type I interferonopathy and/or other STING-mediated disease comprising administering to a subject an effective amount of the compound or a salt thereof according to claim 15 .

18 . The compound or a salt thereof according to claim 1 , wherein the compound is 1-[(3R,4S)-3,4-dihydroxypyrrolidin-1-yl]-3-[2-(trifluoromethyl)[1,1′-biphenyl]-4-yl]prop-2-yn-1-one, and wherein the compound is crystalline and has an X-ray powder diffraction spectrum comprising angles 2θ (°): 4.0, 8.0, 12.0, 12.7, 15.1, 16.7, 18.1, 18.9, 19.6, and 22.2.

19 . The compound or a salt thereof according to claim 1 , wherein the compound is 1-{3-[2-(trifluoromethyl)[1,1′-biphenyl]-4-yl]prop-2-ynoyl}piperidine-4-carboxamide, and wherein the compound is crystalline and has an X-ray powder diffraction spectrum comprising angles 2θ (°): 5.7, 7.7, 13.4, 14.2, 15.4, 16.0, 16.6, 18.3, 23.7, and 25.7.

20 . The compound or a salt thereof according to claim 1 , wherein the compound is 1-imino-4-{3-[2-(trifluoromethyl)[1,1′-biphenyl]-4-yl]prop-2-ynoyl}-1λ 6 -thiomorpholin-1-one, and wherein the compound is crystalline and has an X-ray powder diffraction spectrum comprising angles 2θ (°): 4.2, 12.5, 14.4, 14.9, 16.7, 17.1, 18.6, 19.7, 22.0, and 25.4.

21 . A pharmaceutical composition comprising the compound or a salt thereof according to claim 18 and one or more pharmaceutically acceptable excipients.

22 . A pharmaceutical composition comprising the compound or a salt thereof according to claim 19 and one or more pharmaceutically acceptable excipients.

23 . A pharmaceutical composition comprising the compound or a salt thereof according to claim 20 and one or more pharmaceutically acceptable excipients.