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-dihydropyridines
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-dihydropyridines