Heterocyclic studies. Part XIII. Ready ring cleavage of some pyrimidine derivatives to give highly substituted ethylenes
作者:Jim Clark、I. Gelling、I. W. Southon、M. S. Morton
DOI:10.1039/j39700000494
日期:——
Treatment of 6-chloro-4-dialkylamino-5-nitropyrimidines (Ia–d) under acidic conditions resulted in ring cleavage and formation of 3-amino-3-dialkylamino-2-nitroacrylonitriles (IIIa–d). Similar treatment of 4-amino- or 4-alkylamino-6-chloro-5-nitropyrimidines also gave acrylonitriles (IIIe–i) but 4-amino- or 4-alkylamino-5-nitropyrimidin-6(1H)-ones (IIe–i) were formed at the same time.
在酸性条件下处理6-氯-4-二烷基氨基-5-硝基嘧啶(Ia–d)会导致环断裂并形成3-氨基-3-二烷基氨基-2-硝基丙烯腈(IIIa–d)。对4-氨基-或4-烷基氨基-6-氯-5-硝基嘧啶的类似处理也得到了丙烯腈(IIIe–i),但4-氨基或4-烷基氨基-5-硝基嘧啶-6(1 H)-一个(IIe) –i)是同时成立的。