Quinolone derivatives of formula (1) are described:
1
wherein:
X is an O or S atom;
R
1
is an aliphatic, cycloaliphatic, or cycloalkyl-alkyl-group;
R
2
is a —CN group or an optionally substituted heteroaromatic group;
R
3
is a hydrogen atom or an alkyl, —CN, —CO
2
H, —CO
2
R
6
or —CONR
7
R
8
group;
R
4
is a chain -Alk
1
-L
1
-Alk
2
-R
9
;
R
5
is a hydrogen atom or an alkyl group;
or NR
4
R
5
forms an optionally substituted heterocycloaliphatic ring optionally fused to an optionally substituted monocyclic C
6-12
aromatic group or an optionally substituted monocyclic C
1-9
heteroaromatic group; and the salts, solvates, hydrates, tautomers, isomers or N-oxides thereof.
The compounds are potent inhibitors of IMPDH and are of use as immunosuppressants, anti-cancer agents, anti-inflammatory agents, antipsoriatic and anti-viral agents.