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4-(2¡¯-nitrophenyl) -2,6-dimethyl-3 ,5-dicarbomethoxy 1,4-dihydropyridine 45 g. 2 - nitrobenzaldehyde, 80 cc. acetoacetic acid methyl ester, 75 cc. methanol and 32 cc. ammonia are heated under reflux for several hours, filtered off, cooled and, after suction-filtration, 75 g. of yellow crystals of M.P. 172¡ã C. to 174¡ã C. are obtained. In an analogous manner there are obtained:from 2-nitro-benzaldehyde, acetoacetic acid ethyl ester and ammonia, 4 - (2¡¯ - nitrophenyl) - 2,6 - dimethyl 3,5 - dicarbethoxy - 1,4 - dihydropyridine, M.P. 122¡ã C to 124¡ã C., from 2-nitrobenzaldehyde, acetoacetic acid, isopropyl acid and ammonia, 4 - (2¡¯ - nitrophenyl) - 2,6 - dimethyl - 3,5 - dicarbo - isopropoxy - 1,4 - dihydro pyridine, M.P. 140¡ã C. to 142¡ã C. |
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