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ye5731322

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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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1楼 2009-11-16 11:47:16

已阅回复此楼关注TA 给TA发消息送TA红花 TA的回帖

yjhorn

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在线: 18.3小时
虫号: 33078
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ye5731322(金币+1,VIP+0):谢谢 11-17 11:06
zap65535(金币+5,VIP+0):补发 12-22 03:24

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??