| 摘要 |
The process of the invention relates to the reaction of hydrazones of formula II <IMAGE> (II) with alpha -chloro- or alpha -bromoarylonitrile or alpha -chloro- or alpha -bromoacrylates of formula III <IMAGE> (III) to 1-amino-2-cyano-1,4-dihydropyridines or 1-amino-1,4-dihydropyridine-2-carboxylic acid esters of formula IV <IMAGE> (IV) which are converted into pyridine derivatives of formula I <IMAGE> (I) by treatment with an acid, with removal of R4R5NH. Y is -CN or -COOR3 and R1 to R5 may be alkyl.
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