PYRAZOLOPYRIDINE DERIVATIVES

摘要

Compounds of formula (I), or a salt thereof, or a solvate thereof, wherein, R 1 is halo, -N=N-heteroaryl, -CO2R5, -NHCH2R6; or -CONR7R8; R2 is H or aryl; R3 is H or aryl, wherein the aryl ring may be optionally substituted by one or more substituents, which may be the same or different, selected from halo; R4 is H; R5 is alkyl; and R6 is H, alkyl, cycloalkyl, aryl or aralkyl; R7 and R8 are selected from H and alkyl; and with the proviso that when R1 is halo, at least one of R2 and/or R3 is aryl; a process for preparing such compounds, a pharmaceutical composition comprising such compounds and the use of such compounds and composition in medicine.