Cyclization of 2-Alkynylallyl Alcohols to Highly Substituted Furans by Gold(I)-Carbene Complexes
作者:A. Stephen K. Hashmi、Tobias Häffner、Matthias Rudolph、Frank Rominger
DOI:10.1002/ejoc.201001479
日期:2011.2
Various 2-alkynylallyl alcohols were synthesized by a generally applicable Sonogashira coupling protocol. Subsequent gold-catalyzed transformation was investigated. The use of AuI catalysts bearing carbene ligands, of either the N-heterocyclic carbene or nitrogen acyclic carbene type, delivered the desired products with low catalyst loadings and under very mild reaction conditions. A broad array of
通过普遍适用的 Sonogashira 偶联方案合成了各种 2-炔基烯丙醇。研究了随后的金催化转化。使用带有卡宾配体的 AuI 催化剂,无论是 N-杂环卡宾还是氮无环卡宾类型,都能以低催化剂负载量和非常温和的反应条件提供所需的产物。测试了多种底物,包括烷基、烯基和芳基取代的炔烃,以及具有两个炔基部分的底物。结果证明该方法具有广泛的范围。仲烯丙醇也可以耐受,并且可以高产率分离得到的三取代呋喃。