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4 (4’ - nitrophenyl) - 2,6 - dimethyl-3,5-dicarbethoxy-1,4- dihydropyridine 151 g. 4-nitrobenzaldehyde, 300 cc. methanol, 260 cc. acetoacetic acid ethyl ester and 110 cc. ammonia are heated under reflux for 5 hours and, after cooling and suction-filtration, there are obtained 375 g. of yellow crystals which melt at 132° C.—134° C. after recrystalliza tion from methanol. In an analogous manner there are obtained: from 4-nitrobenzaldehyde, acetoacetic acid methyl ester and ammonia, 4-(4’-nitrophenyl) -2,6-dimethyl-3,5-di- carbomethoxy-1,4-dihydropyridine, M.P. 1960 C.—197° C., from 4-nitrobenzaldehyde, acetoacetic acid isopropyl ester and ammonia, 4-(4’-nitrophenyl) -2,6-dimethyl-3,5-di- carbo-isopropoxy-l,4-dihydropyridine, M.P. 152° C., from 4 - nitrobenzaldehyde, acetoacetic acid ten. - butyl ester and ammonia, 4-(4-nitrophenyl) -2,6-dimethyl-3,5- - dicarbo-tert.-butoxy-l,4-dihydropyridine, M.P. 215° C |
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4楼2009-11-16 16:42:17
yzhang1986
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2楼2009-11-16 16:03:33
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ye5731322(金币+1,VIP+0):谢谢 11-17 11:06
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4?0?2 ?0?2 (4??-??????) - 2,6 - ?????-3,5-?????????-1,4- ??????? ??151??4-?????????,300cc.???, 260cc.??????????????110cc.?????????5h???????????????????ü??????????375g??????壬?????132??-134?? ??????????????4-?????????,??????????????,????4-(4??-??????) -2,6-?????-3,5-?????????-1,4-?????????????196-197C??????4-?????????,????????????????,???4-(4??-??????)-2,6-?????-3,5-??????????-l,4-???????,???152??C?? ????4-????????????????????-???? ???, ???4-(4-??????) -2,6-?????-3,5-??????-???????-l,4-??????????? 215?? |
3楼2009-11-16 16:41:17
