ALIPHATIC NITROGENOUS FIVE-MEMBERED RING COMPOUNDS

摘要

Aliphatic nitrogenous five-membered ring compounds of the general formula [I ] or pharmacologically acceptable salts thereof; a process for the preparation of the compounds or the salts; and pharmaceutical compositions containing th e compounds or the salts as the active ingredient: [I] wherein A is CH2- or S- ; R1 is hydrogen, lower alkyl, hydroxy-lower alkyl, or lower alkoxy-lower alky l; X is N(R3)-, -O-, or CO-; R3 is hydrogen or lower alkyl; and R2 is an optionally substituted cyclic group or optionally substituted amino.