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EXAMPLE 2 4- (3’-nitrophenyl) -2,6-dimethyl-3,5-dicarbethoxy-I ,4-dihydropyridine After boiling for 6 hours, 151 g. 3-nitrobenzaldehyde 260 cc. acetoacetic acid ethyl ester, 250 cc. methanol and 110 cc. ammonia, there are obtained 300 g. of yellow crystals of M P 161° C In an analogous manner there are obtained: from 3-nitrobenzaldehyde, acetoacetic acid methyl ester and ammonia, 4- (3 ‘-nitrophenyl) -2,6-dimethyl-3,5-di- carbomethoxy-1,4-dihydropyridine, M.P. 206° C.—208° C., from 3-nitrobenzaldehyde, acetoacetic acid isopropyl ester and ammonia, 4-( 3’-nitrophenyl) -2,6-dimethyl-3,5-di- carbo-isopropoxy-1,4-dihydropyridine, M.P. 1230 C., from 3-nitro-4-chlorobenzaldehyde, acetoacetic acid ethyl 10 ester and ammonia, 4-(3’-nitro-4’.chlorophenyl)-2,6- dimethyl-3,5-dicarbethoxy-1,4-dihydropyridine, M.P. 133° C., from 3 - nitro - 6 - chlorobenzaldehyde, acetoacetic acid methyl ester and ammonia, 4- (3’ - nitro - 6’ - chloro- 15 phenyl) - 2,6-dimethyl-3,5-dicarbomethoxy-1,4-dihydro- pyridine, M.P. 190° C.—192° C., from 3 - nitro - 6 - chlorobenzaldehyde, acetoacetic acid methyl ester and ammonia, 4-(3-nitro-6’-chlorophenyl)- 2,6 - dimethyl - 3,5 - dicarbethoxy-1,4-dihydropyridine, M.P. 202° C.—205° C. |
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