| abstract |
The invention provides compounds of the formula (I):n n or salts, tautomers, solvates and N-oxides thereof; wherein R 1 is hydroxy or hydrogen; R 2 is hydroxy; methoxy or hydrogen; provided that at least one of R 1 and R 2 is hydroxy; R 3 is selected from hydrogen; halogen; cyano; optionally substituted C 1-5 hydrocarbyl and optionally substituted C 1-5 hydrocarbyloxy; R 4 is selected from hydrogen; a group -(O) n -R 7 where n is 0 or 1 and R 7 is an optionally substituted acyclic C 1-5 hydrocarbyl group or a monocyclic carbocyclic or heterocyclic group having 3 to 7 ring members; halogen; cyano; hydroxy; amino; and optionally substituted mono- or di-C 1-5 hydrocarbylamino; or R 3 and R 4 together form a monocyclic carbocyclic or heterocyclic ring of 5 to 7 ring members; and NR 5 R 6 forms an optionally substituted bicyclic heterocyclic group having 8 to 12 ring members of which up to 5 ring members are heteroatoms selected from oxygen, nitrogen and sulphur. n The compounds have activity as Hsp90 inhibitors. |