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ye5731322

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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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