A benzannulation strategy for the synthesis of phenols and heteroaromatic compounds based on the reaction of (trialkylsilyl)vinylketenes with lithium ynolates
作者:Wesley F. Austin、Yongjun Zhang、Rick L. Danheiser
DOI:10.1016/j.tet.2007.10.113
日期:2008.1
(Trialkylsilyl)vinylketenes react with lithium ynolates to generate 3-(oxido)dienylketenes, which undergo rapid 6π-electrocyclization. The ultimate products of this benzannulation are highly substituted resorcinol monosilyl ethers, which are formed via a [1,3] carbon to oxygen silyl group shift. Further transformations of the benzannulation products are described providing efficient access to ortho-benzoquinones
(三烷基甲硅烷基)乙烯基烯酮与炔醇锂反应生成 3-(氧化)二烯基烯酮,其经历快速 6π-电环化。这种苯环化的最终产物是高度取代的间苯二酚单甲硅烷基醚,它是通过 [1,3] 碳到氧甲硅烷基的转变形成的。描述了苯并环化产物的进一步转化,提供了对邻苯醌和苯并呋喃、苯并氧杂和苯并氧辛环系统的有效访问。