| abstract |
PCT No. PCT/GB94/00539 Sec. 371 Date May 24, 1995 Sec. 102(e) Date May 24, 1995 PCT Filed Mar. 17, 1994 PCT Pub. No. WO94/21610 PCT Pub. Date Sep. 29, 1994Piperazine derivatives of formula (I) and their salts are 5-HT1A binding agents and may be used, for example, as anxiolytics. In the formula, R, R2 and R4 are hydrogen or lower alkyl, R1 is mono- or bicyclic aryl or heteroaryl, R3 is lower alkyl or cycloalkyl, A is an alkylene chain and X is -CO-. -CR5OH- (where R5 is hydrogen, lower alkyl or cycloalkyl), -S-, -SO- or -SO2- or X can also be -(CH2)n- (where n is 0, 1 or 2) when R3 is cycloalkyl. <IMAGE> (I) |