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 functionalizedguanidines can be obtained. The reaction is tolerant of a wide range of functional groups