Direct Conversion of Aldehydes and Ketones to Allylic Halides by a NbX5-[3,3] Rearrangement
作者:Fraser Fleming、P. Ravikumar、Lihua Yao
DOI:10.1055/s-0028-1088222
日期:2009.4
bromide and NbCl(5), or NbBr(5), to a series of aldehydes and ketones directly provides homologated, allylic halides. Transposition of the intermediate vinyl alkoxide is envisaged through a metalla-halo-[3,3] rearrangement with concomitant delivery of the halogen to the terminal carbon. The [3,3] rearrangement is equally effective for the conversion of a propargyllic alcohol to the corresponding allenyl
将乙烯基溴化镁和 NbCl(5) 或 NbBr(5) 依次添加到一系列醛和酮中,可直接提供同系的烯丙基卤化物。中间体乙烯基醇盐的转位是通过金属卤代-[3,3] 重排与卤素同时传递到末端碳来实现的。[3,3] 重排对于将炔丙醇转化为相应的烯基溴同样有效。