Amide compound

1. A compound represented by the following formula (I):

wherein

Ring A is a 6-membered aromatic ring optionally further substituted by 1 to 3 substituents selected from

(1) a halogen atom, and

(2) a cyano group;

R 1 is

(1) a group represented by the formula: -Q(R 1a )(R 1b )(R 1c )

wherein

Q is a carbon atom, a silicon atom or a germanium atom, and

R 1a , R 1b and R 1c are each independently

(a) a C 1-6 alkyl group optionally substituted by 1 to 3 substituents selected from

(i) a halogen atom, and

(ii) a C 1-6 alkoxy group,

(b) a hydroxy group,

(c) a C 6-14 aryl group,

(d) a C 3-10 cycloalkyl group,

(e) a cyano group,

(f) a carbamoyl group optionally mono- or di-substituted by C 3-10 cycloalkyl group(s), or

(g) a 3- to 8-membered monocyclic non-aromatic heterocyclylcarbonyl group, or

R 1a and R 1b in combination form, together with the adjacent Q, a C3-10 cycloalkane ring,

(2) a neopentyl group, or

(3) a trimethylsilylmethyl group;

R 2 is

(1) a group represented by the formula:

wherein

R 5 is

(A) a C 1-6 alkyl group optionally substituted by 1 to 3 substituents selected from

(a) a C 1-6 alkoxy group optionally substituted by 1 to 3 substituents selected from

(i) a halogen atom, and

(ii) a C 1-6 alkoxy group, and

(b) a hydroxy group, or

(B) a C 1-6 alkoxy group optionally substituted by 1 to 3 C 1-6 alkoxy groups, and

the benzene ring in the formula optionally has, besides R 5 , additional 1 to 3 substituents selected from

(A) a C 1-6 alkyl group, and

(B) a C 1-6 alkoxy group,

(2) a bicyclic fused heterocyclic group optionally substituted by 1 to 3 C1-6 alkyl groups, or

(3) a group represented by the formula -L-Z 1 :

wherein

L is a bond; and

Z 1 is

(A) a C 3-10 cycloalkyl group optionally substituted by 1 to 3 substituents selected from

(a) a halogen atom, and

(b) a hydroxy group, or

(B) a 3- to 8-membered monocyclic non-aromatic heterocyclic group optionally substituted by C 1-6 alkyl group(s) optionally substituted by 1 to 3 halogen atoms;

R 3 is

(1) a hydrogen atom, or

(2) a C 1-6 alkyl group optionally substituted by 1 to 3 cyano groups; and

R 4 is

(1) a C 1-6 alkyl group optionally substituted by 1 to 7 substituents selected from

(a) a 3- to 8-membered monocyclic non-aromatic heterocyclic group optionally substituted by 1 to 3 substituents selected from

(i) an oxo group,

(ii) a C 1-6 alkyl group,

(iii) a hydroxy group, and

(iv) a cyano group,

(b) a 5- or 6-membered monocyclic aromatic heterocyclic group optionally substituted by 1 to 3 substituents selected from

(i) a C 1-6 alkyl group optionally substituted by 1 to 3 substituents selected from a halogen atom and a C 6-14 aryl group,

(ii) a hydroxy group, and

(iii) a C 1-6 alkoxy group optionally substituted by 1 to 3 C 6-14 aryl groups,

(c) a 8- to 14-membered fused polycyclic aromatic heterocyclic group,

(d) a 9- to 14-membered fused polycyclic non-aromatic heterocyclic group optionally substituted by 1 to 3 oxo groups,

(e) a halogen atom,

(f) a hydroxy group,

(g) a cyano group,

(h) a carboxy group,

(i) a carbamoyl group,

(j) a C 1-6 alkylsulfonyl group,

(k) a C 3-10 cycloalkyl group optionally substituted by 1 to 3 substituents selected from

(i) a hydroxy group, and

(ii) a cyano group,

(l) an amino group optionally mono- or di-substituted by substituent(s) selected from

(i) a C 1-6 alkyl group,

(ii) a C 1-6 alkyl-carbonyl group, and

(iii) a C 1-6 alkoxy-carbonyl group,

(m) an imino group optionally substituted by a hydroxy group, and

(n) a 5- or 6-membered monocyclic aromatic heterocyclyloxy group optionally substituted by 1 to 3 C 1-6 alkyl groups,

(2) a 3- to 8-membered monocyclic non-aromatic heterocyclic group selected from the group consisting of pyrrolidinyl, oxazolidinyl, azetidinyl, piperidyl, tetrahydropyranyl, tetrahydrothiopyranyl, 1,1-dioxidotetrahydrothiopyranyl, 1-oxidotetrahydrothiopyranyl, imidazolidinyl, tetrahydrofuryl, 1,1-dioxidotetrahydrothienyl, morpholinyl, dihydrooxazolyl, dihydrothiazolyl, piperazinyl and dihydrooxadiazolyl, each optionally substituted by 1 to 3 substituents selected from

(a) an oxo group,

(b) a hydroxy group,

(c) a cyano group,

(d) a halogen atom,

(e) a C 1-6 alkyl group optionally substituted by 1 to 3 hydroxy groups,

(f) a C 1-6 alkoxy group optionally substituted by 1 to 3 C 6-14 aryl groups,

(g) a C 1-6 alkyl-carbonyl group, and

(h) a C 1-6 alkylidene group optionally substituted by 5- or 6-membered monocyclic aromatic heterocyclic group(s) optionally substituted by 1 to 3 substituents selected from

(i) a C 1-6 alkyl group, and

(ii) a halogenated boryl group,

(3) a 5-membered monocyclic aromatic heterocyclic group optionally substituted by 1 to 3 substituents selected from

(a) a hydroxy group,

(b) a cyano group,

(c) a carboxy group,

(d) a halogen atom,

(e) a C 1-6 alkyl group optionally substituted by 1 to 3 hydroxy groups,

(f) a C 1-6 alkoxy group,

(g) a C 1-6 alkoxy-carbonyl group, and

(h) an amino group optionally mono- or di-substituted by C 1-6 alkyl-carbonyl group(s),

(4) a C 3-10 cycloalkyl group optionally substituted by 1 to 3 substituents selected from

(a) a halogen atom,

(b) a hydroxy group,

(c) an oxo group,

(d) a cyano group,

(e) a carboxy group, and

(f) a C 1-6 alkyl group optionally substituted by 1 to 3 hydroxy groups,

(5) a C 2-6 alkenyl group optionally substituted by 1 to 3 substituents selected from

(a) a carbamoyl group, and

(b) a hydroxy group,

(6) a C 6-14 aryl group optionally substituted by 1 to 3 hydroxy groups,

(7) a 9- to 14-membered fused polycyclic non-aromatic heterocyclic group optionally substituted by 1 to 3 oxo groups,

(8) a 8- to 14-membered fused polycyclic aromatic heterocyclic group,

(9) a C 1-6 alkoxy-carbonyl group,

(10) a 5- to 14-membered spiro heterocyclic group,

(11) a 3- to 8-membered monocyclic non-aromatic heterocyclyloxy group, or

(12) an amino group optionally mono- or di-substituted by substituent(s) selected from

(a) a C 1-6 alkyl group optionally substituted by 1 to 3 hydroxy groups, and

(b) a 5- or 6-membered monocyclic aromatic heterocyclic group; or

when R 3 is a substituent, R 3 and R 4 in combination form, together with the nitrogen atom adjacent to R 3 and the carbon atom adjacent to R 4 , a 3- to 14-membered non-aromatic heterocycle selected from the group consisting of pyrrolidine and 2,7-diazaspiro[4.4]nonane, each substituted by one oxo group and each optionally further substituted by 1 to 3 oxo groups,

provided that

α-(acetylamino)-N-[4-(1,1-dimethylettyl)phenyl]-cyclopentaneacetamide

is excluded,

or a salt thereof.

2. The compound or salt of claim 1 , wherein the substituent that Ring A optionally further has is a fluorine atom or a chlorine atom.

3. The compound or salt of claim 1 , wherein R 1 is a tert-butyl group, a neopentyl group or a trimethylsilyl group.

4. The compound or salt of claim 1 , wherein R 2 is

(1) a group represented by the formula:

wherein R 5 is an alkoxy group or an alkoxyalkyl group,

(2) a tetrahydro-2H-pyran-4-yl group,

(3) a 4,4-difluorocyclohexyl group,

(4) a 1-methyl-1H-indazol-5-yl group, or

(5) a 2,3-dihydro-1-benzofuran-5-yl group.

5. The compound or salt of claim 1 , wherein R 3 is a hydrogen atom or a methyl group.

6. (3S)-N-((1 R)-2-((4-tert-Butyl-3-fluorophenyl)amino)-1-(4,4-difluorocyclohexyl)-2-oxoethyl)-5-oxopyrrolidine-3-carboxamide or a salt thereof.

7. N-((1R)-2-((3,5-Difluoro-4-(trimethylsilyl)phenyl)amino)-1- (4-methoxyphenyl)-2-oxoethyl)-3-hydroxy-N-methyl-1,2-oxazole-5-carboxamide or a salt thereof.

8. (2R)-N-(4-tert-Butyl-3,5-difluorophenyl)-2-(((3-hydroxy-1,2-oxazol-5-yl)acetyl)amino)-2-(1-methyl-1H-indazol-5-yl)acetamide or a salt thereof.

9. A medicament comprising the compound or salt of claim 1 .

10. A medicament comprising

the compound or salt of claim 1 , which is a RORγt inhibitor.

11. A medicament comprising

the compound or salt of claim 1 , which is an agent for the treatment of psoriasis, inflammatory bowel disease (IBD), ulcerative colitis (UC), Crohn's disease (CD), rheumatoid arthritis, multiple sclerosis, uveitis, asthma, ankylopoietic spondylarthritis or systemic lupus erythematosus (SLE).

12. A compound selected from the group consisting of:

(3S)-N-((1R)-2-((3-fluoro-4-(trimethylsilyl)phenyl)amino)-1-(4-(methoxymethyl)phenyl)-2-oxoethyl)-5-oxopyrrolidine-3-carboxamide,

N-((1R)-2-((3-fluoro-4-(trimethylsilyl)phenyl)amino)-1-(4-methoxyphenyl)-2-oxoethyl)-3-hydroxy-N-methyl-1,2-oxazole-5-carboxamide,

N-(2-((3-fluoro-4-(trimethylsilyl)phenyl)amino)-1-(4-(methoxymethyl)phenyl)-2-oxoethyl)-5-oxopyrrolidine-3-carboxamide,

(2R)-2-(((2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)acetyl)amino)-N-(3-fluoro-4-(trimethylsilyl)phenyl)-2-(4-(methoxymethyl)phenyl)acetamide,

(2R)-N-(3-fluoro-4-(trimethylsilyl)phenyl)-2-(4-(methoxymethyl)phenyl)-2-(((4-oxopyridazin-1(4H)-yl)acetyl)amino)acetamide,

1-acetyl-N-((1R)-2-((3-fluoro-4-(trimethylsilyl)phenyl)amino)-1-(4-(methoxymethyl)phenyl)-2-oxoethyl)piperidine-4-carboxamide,

(2R)-N-(3-fluoro-4-(trimethylsilyl)phenyl)-2-(((3-hydroxy-1,2-oxazol-5-yl)acetyl)amino)-2-(4-(methoxymethyl)phenyl)acetamide,

(2R)-N-(3-fluoro-4-(trimethylsilyl)phenyl)-2-(4-(methoxymethyl)phenyl)-2-(((4-oxopyridin-1(4H)-yl)acetyl)amino)acetamide,

(2R)-N-(4-tert-butyl-3-fluorophenyl)-2-(4-(methoxymethyl)phenyl)-2-(((6-oxopyrimidin-1(6H)-yl)acetyl)amino)acetamide,

(3R)-N-((1R)-2-((4-tert-butyl-3-fluorophenyl)amino)-1-(4-(methoxymethyl)phenyl)-2-oxoethyl)-5-oxopyrrolidine-3-carboxamide,

N-((1R)-2-((3,5-difluoro-4-(trimethylsilyl)phenyl)amino)-2-oxo-1-(tetrahydro-2H-pyran-4-yl)ethyl)-3-hydroxy-N-methyl-1,2-oxazole-5-carboxamide,

N-((1R)-2-((4-tert-butyl-3-chlorophenyl)amino)-2-oxo-1-(tetrahydro-2H-pyran-4-yl)ethyl)-3,3,3-trifluoro-2-hydroxypropanamide,

(2R)-N-(2,5-difluoro-4-(trimethylsilyl)phenyl)-2-(4-(methoxymethyl)phenyl)-2-(((5-methyl-1,3,4-oxadiazol-2-yl)acetyl)amino)acetamide, and

(2R)-N-(4-tert-butyl-3-fluorophenyl)-2-(((2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)acetyl)amino)-2-(4-(methoxymethyl)phenyl)acetamide,

or a salt thereof.

13. A compound of (3R)-N-((1R)-2-((3-fluoro-4-(trimethylsily) phenyl)amino)-1-(4-(methoxymethyl)phenyl)-2-oxoethyl)5-oxopyrrolidine-3-carboxamide, or a salt thereof.