作者:S.M.S. Chauhan、H. Junjappa
DOI:10.1016/0040-4020(76)85174-5
日期:1976.1
4-diamino-5-p-chlorophenyl-6-methylthio-pyrimidine (11) was prepared from 9c as a typical example using identifical conditions described for 7. The synthesis of 5,6-fused pyrimidines (14a–f), (19) and (23a–e) was also accomplished using the cyclic ketene-S,S-acetals (13a–c) and (22a–b). The present method is found to be more convenient and efficient than reported methods for alkoxy and methylthiopyrimidines
酮醇-S,S-乙缩醛(5a–c)在醇性钠的醇盐存在下与胍和硫脲反应,得到2-氨基和2-巯基-4-烷氧基-5-芳基-6-甲基-吡啶二酰亚胺(6a–k)分别以良好的收成。α-氰基碳烯-S,S-乙缩醛(9a–d)同样产生了带有胍的5-取代的2,4-二氨基-6-烷氧基-吡啶亚胺(10a-e),总收率为50-60%。未交换的2,4-二氨基-5- p -氯苯基-6-甲硫基嘧啶(11)制备图9c为使用用于描述identifical条件的典型例子7。5,6-稠合嘧啶的合成(14a–f),(19)和(23a–e)也使用环状乙烯酮-S,S-缩醛(13a–c)和(22a–b)完成。发现本方法比报道的烷氧基和甲硫基嘧啶的方法更方便和有效。