Pyrimidine derivatives and related compounds. 38. Synthesis of 1,3-oxazine-2,4-diones and their reaction with nucleophiles. Ring transformation of 1,3-oxazines to pyrimidines
作者:Motoi Yogo、Kosaku Hirota、Shigeo Senda
DOI:10.1002/jhet.5570180607
日期:1981.10
the corresponding 6-chloro derivatives (1 and 2). Treatment of 6-chloro-3-methyl-1,3-oxazine-2,4-dione (1a) with sodium azide, sodium cyanide, secondary amines and aniline gave the corresponding 6-substituted compounds (7, 9, 10 and 11) while the reaction of 1a and 2a,b with primary aliphatic amines such as methylamine and ethylamine caused a ring transformation to pyrimidine ring system giving barbituric
通过还原相应的6--,制备5,6-未取代的1,3-恶嗪-2,4-二酮(3)和6-未取代的5-甲基-1,3-恶嗪-2,4-二酮(4)。氯衍生物(1和2)。用叠氮化钠,氰化钠,仲胺和苯胺处理6-氯-3-甲基-1,3-恶嗪-2,4-二酮(1a)得到相应的6-取代的化合物(7,9,10和11),而1a和2a,b与脂族伯胺(例如甲胺和乙胺)的反应则导致环转化为嘧啶环系统,从而生成巴比妥酸(13a-d)。