Modification of the Fritsch–Buttenberg–Wiechell rearrangement: a facile route to unsymmetrical butadiynes
作者:Erin T Chernick、Sara Eisler、Rik R Tykwinski
DOI:10.1016/s0040-4039(01)01901-3
日期:2001.12
echell rearrangement has been used to form unsymmetrically substituted 1,3-butadiynes from 1,1-dibromo-olefin precursors. The reaction proceeds via lithium–halogen exchange, followed by migration of the aryl or alkynyl moiety to provide the butadiyne framework. The facile formation of the dibromo-olefins in three steps from commercially available aryl aldehydes or carboxylic acid chlorides makes this
Fritsch–Buttenberg–Wiechell重排的一种修饰已用于从1,1-二溴烯烃前体形成不对称取代的1,3-丁二炔。反应通过锂-卤素交换进行,然后芳基或炔基部分迁移以提供丁二炔骨架。由市售的芳基醛或羧酸氯化物分三步轻松形成二溴代烯烃,使该方法成为传统丁二炔合成方法的有吸引力的替代方法。