A convenient synthesis of 5-cyano-6-dialkylamino-2-hydroxy-3-methoxycarbonyl-2-methyl-4-(2- or 4-nitrophenyl)-1,2,3,4-tetrahydropyridines and their dehydration to 5-cyano-6-dialkylamino-3-methoxycarbonyl-2-methyl-4-(2- or 4-nitrophenyl)-1,4-dihydropyridin

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