PROCESS FOR THE PREPARATION OF ACRYLOYL-PIPERAZINE DERIVATIVES AND PHARMACEUTICAL COMPOSITIONS CONTAINING THEM

摘要

Compounds of formula (I): [in which R<1> and R<2> is each -R<5>, -CH=CH-R<5> or -C IDENTICAL C-R<5>, in which R<5> is optionally substituted aryl or aromatic heterocyclic; R<3> is hydrogen, alkyl, cyano or -R<5>; X is oxygen or sulphur; A is 1,4-piperazin-1,4-diyl or a 1,4-homopiperazin-1,4-diyl; B is alkylene, carbonyl, thiocarbonyl, sulphinyl or sulphonyl; and R<4> is optionally substituted phenyl] and pharmaceutically acceptable salts thereof have valuable PAF antagonist activity, and may be prepared by reacting a compound containing the piperazine or homopiperazine part of the molecule with a compound containing the other part of the molecule.