Imidazopyridine-spiro-piperidine compounds

摘要

An imidazopyridine-spiro-piperi dine compound of the formula: <IMAGE> or a pharmaceutically acceptable acid addition salt thereof, wherein X represents hydrogen, halogen or lower alkoxy, Y represents >N- or >C=CH-, R1 and R2 both represent hydrogen or combinedly form a single bond, Alk represents lower alkylene, and R3 and R4 both represent hydrogen or combinedly form a single bond. Such compounds are useful as psychotropics.