Synthesis of Unsymmetrically Substituted 1,3-Butadiynes and 1,3,5-Hexatriynes via Alkylidene Carbenoid Rearrangements
作者:Annabelle L. K. Shi Shun、Erin T. Chernick、Sara Eisler、Rik R. Tykwinski
DOI:10.1021/jo026481h
日期:2003.2.1
Unsymmetrically substituted 1,3-butadiynes and 1,3,5-hexatriynes are synthesized in four steps from commercially available aldehydes or carboxylic acids. The key step in this process involves a Fritsch-Buttenberg-Wiechell rearrangement, in which an alkylidene carbenoid intermediate subsequently rearranges to the desired polyyne. This rearrangement proceeds under mild conditions, and it is tolerant
不对称取代的1,3-丁二炔和1,3,5-己三炔由市售的醛或羧酸分四个步骤合成。该过程中的关键步骤涉及Fritsch-Buttenberg-Wiechell重排,其中亚烷基类胡萝卜素中间体随后重排为所需的多炔。这种重排在温和的条件下进行,并且可以耐受一系列功能。通常,在程序上容易形成二溴代烯烃前体,再加上重排步骤的有效性,使得该方法成为利用钯或铜催化的传统的二炔和三炔合成方法的有吸引力的替代方法。