作者:Christopher J. Easton、Alison J. Edwards、Stephen B. McNabb、Martin C. Merrett、Jenny L. O'Connell、Gregory W. Simpson、Jamie S. Simpson、Anthony C. Willis
DOI:10.1039/b303719c
日期:——
A range of dehydro amino acid derivatives has been prepared and subjected to halogenation using either molecular bromine or chlorine, or NBS. Allylic halogenation of the unsaturated amino acid side chains occurs through radical bromination with NBS. The procedure is complementary to treatment with chlorine, which also affords allyl halides. This latter and unusual reaction is shown through a deuterium
已制备了一系列脱氢氨基酸衍生物,并使用分子溴或氯或NBS进行卤化。不饱和氨基酸侧链的烯丙基卤化通过与NBS的自由基溴化而发生。该程序是用氯处理的补充,氯也提供烯丙基卤。通过氘标记研究显示了后者的异常反应是通过离子机理进行的。NBS或氯用于烯丙基卤化物合成的选择显示取决于避免竞争反应的潜力,例如亮氨酸衍生物与氯的卤代内酯化,以及用NBS处理异亮氨酸衍生物时在多个位点提取氢和引入溴。