Phase-Transfer-Catalyzed Alkylation of Guanidines by Alkyl Halides under Biphasic Conditions: A Convenient Protocol for the Synthesis of Highly Functionalized Guanidines
作者:David A. Powell、Philip D. Ramsden、Robert A. Batey
DOI:10.1021/jo0265535
日期:2003.3.1
carbamate-protected guanidines with various alkyl halides and mesylates is described. This protocol proceeds via deprotonation of the acidic N-carbamate hydrogen of the guanidine under biphasic conditions using a catalytic amount of a tetrabutylammonium salt as a phase-transfer catalyst. In this manner, highly functionalized guanidines can be obtained. The reaction is tolerant of a wide range of functional groups
描述了一种操作简单有效的方法,用于将氨基甲酸酯保护的胍与各种烷基卤化物和甲磺酸酯烷基化。该方案通过在双相条件下使用催化量的四丁基铵盐作为相转移催化剂使胍的酸性N-氨基甲酸酯氢去质子化来进行。以这种方式,可以获得高度官能化的胍。该反应可耐受烷基卤和胍组分上的多种官能团。另外,该反应足够温和,使得简单的水后处理和通过短硅胶柱的过滤产生高纯度的取代的胍。结合EDCI介导的双取代硫脲与胺的鸟嘌呤化,