Semicarbazide derivatives, processes for preparation thereof and pharmaceutical composition comprising the same

摘要

A compound of the formula: <IMAGE> wherein R1 is hydrogen, R2 is hydrogen, lower alkyl, ar(lower)alkyl, lower alkenyl or aryl, R3 is lower alkyl, ar(lower)alkyl, lower alkenyl or aryl, or R2 and R3 are taken together to form (C2-C6)-alkylidene group optionally substituted with aryl or taken together with the attached nitrogen atom to form a saturated or unsaturated, 5- or 6-membered heterocyclic group optionally substituted with aryl or lower alkyl; or R1 and R2 are taken together with the attached nitrogen atoms to form a saturated or unsaturated, 5- or 6-membered heterocyclic group or 1,2-diazaspiroalkane-1,2-diyl group, R3 is hydrogen, lower alkyl, ar(lower)alkyl, lower alkenyl or aryl; R4 is lower alkyl optionally substituted with di(lower)alkylamino or a heterocyclic group, or a heterocyclic group optionally having suitable substituent(s), R5 is hydrogen or lower alkyl, and X is O or S, and a pharmaceutically acceptable salt thereof may be used as anti-inflammatory and analgesic agents.