Compounds of formula (IA) or (IB) or salts, N-oxides. hydrates or solvates thereof are Inhibitors of HSP90, and useful in the treatment of, for example, cancer: formula (IA), formula (IB) wherein Ar is an aryl or heteroaryl radical which is linked via a ring carbon, and which is substituted by a hydroxy group on a carbon in the 2-position, and which is otherwise either unsubstituted or optionally substituted; R
1
is hydrogen or optionally substituted C
1
-C
6
alkyl; R
2
is hydrogen, optionally substituted cycloalkyl, cycloalkenyl, C
1
-C
6
alkyl, C
1
-C
6
alkenyl, or C
1
-C
6
alkynyl; or a carboxyl, carboxamide or carboxyl ester group; and R
3
is a carboxamide group.
式(IA)或(IB)的化合物或其盐,N-
氧化物,
水合物或溶剂合物是
HSP90的
抑制剂,并且在癌症治疗中有用:式(IA),式(IB),其中Ar是通过环
碳原子连接的芳基或杂环芳基基团,并且在2位
碳上被
氢氧基取代,在其他方面要么未取代,要么可选地取代; R1是
氢或可选地取代的C1-C6烷基; R2是
氢,可选地取代的
环烷基,环
烯基,C1-C6烷基,C1-C6
烯基或C1-C6炔基; 或羧基,羧
酰胺或
羧酸酯基;和R3是羧
酰胺基团。