Synthesis of Naturally Occurring Acetylenes via an Alkylidene Carbenoid Rearrangement
作者:Annabelle L. K. Shi Shun、Rik R. Tykwinski
DOI:10.1021/jo034734g
日期:2003.8.1
Naturally occurring mosquito larvicidal acetylenes 1 and 2, and analogues 3 and 4, each containing either a 1,3-butadiynyl or a 1,3,5-hexatriynyl moiety, are synthesized via a Fritsch-Buttenberg-Wiechell rearrangement. The alkylidene carbenoid intermediate results from lithium-halogen exchange of a suitable dibromoolefin precursor, and the rearrangement is accomplished under mild conditions. Synthesis
通过Fritsch-Buttenberg-Wiechell重排合成了天然存在的蚊子幼虫乙炔1和2,以及类似物3和4,它们各自包含1,3-丁二炔基或1,3,5-己三炔基。亚烷基类胡萝卜素中间体由合适的二溴烯烃前体的锂-卤素交换产生,并且重排在温和的条件下完成。由商业上可得的羧酸或醛的三步合成很容易地将二溴代烯烃前体合成为乙炔1-4,这使该方法成为合成天然乙炔的常规方法的可行替代方法。