申请人:Ciba-Geigy Corporation
公开号:US04923993A1
公开(公告)日:1990-05-08
The process of the invention relates to the reaction of hydrazones of formula II ##STR1## with .alpha.-chloro- or .alpha.-bromoarylonitrile or .alpha.-chloro- or .alpha.-bromoacrylates of formula III ##STR2## to 1-amino-2-cyano-1,4-dihydropyridines or 1-amino-1,4-dihydropyridine-2-carboxylic acid esters of formula IV ##STR3## which are converted into pyridine derivatives of formula I ##STR4## by treatment with an acid, with removal of R.sub.4 R.sub.5 NH. Y is --CN or --COOR.sub.3 and R.sub.1 to R.sub.5 may be alkyl.
该发明的过程涉及式II的肼酮与α-氯或α-溴芳基腈或式III的α-氯或α-溴丙烯酸酯的反应,生成1-氨基-2-氰基-1,4-二氢吡啶或1-氨基-1,4-二氢吡啶-2-羧酸酯的式IV,通过用酸处理并去除R.sub.4 R.sub.5 NH转化为式I的吡啯衍生物。其中Y为--CN或--COOR.sub.3,R.sub.1至R.sub.5可能是烷基。