| abstract |
The present invention provides a pyrazolo[1,5-a]pyrimidine compound, having CB1 receptor-antagonizing activity, of the following formula [I]: in which R 1 and R 2 are the same or different and each an optionally substituted aryl group etc, R 0 is hydrogen atom, an alkyl group etc, E is a group of the formula: —C(═O)— or —SO 2 —, R is a group of the following formula [i], [ii] or [iii] etc: Ring A is (a) a C 3-8 cycloalkyl group optionally fused to a benzene ring or (b) a benzene ring, Q is a single bond or a methylene group, Ring B is a 4- to 7-membered aliphatic heterocyclic group, said cyclic group binding via its ring-carbon atom to the adjacent nitrogen atom, X is sulfur atom etc, R 3 is an alkyl group optionally substituted by an alkylthio group, R 4 is hydrogen atom, an alkyl group etc, one of R A and R B is an alkyl group etc, and the other is hydrogen atom, an alkyl group etc, or a pharmaceutically acceptable salt thereof. |