Patent ID: 6835851
Filing Date: 2004-12-28
Classification: C07C,C07D

Abstract:
A process for preparing a compound of formula (I): wherein:R1 represents: a phenyl group; or a 3,4-methylenedioxyphenyl group; R2 represents a hydrogen atom or a lower alkyl group; R3 represents a lower alkyl group or a lower phenylalkylene group; and R4 represents a linear or branched aliphatic acyl radical or an aromatic acyl radical, said process comprising step (B) performing a MichaÃ«l addition of a thioacid of formula (IV): R4SHâ€ƒâ€ƒ(IV) wherein R4 has the same meaning as in formula (I), with an &agr;-substituted acrylamide derivative of formula (V): wherein R1, R2 and R3 have the same meaning as in formula (I).