作者:Dominik Nitsch、Thorsten Bach
DOI:10.1021/jo5009993
日期:2014.7.3
convergent synthesis of the title compounds is reported, which relies on a successive 2-fold SN′-type substitution reaction at methoxy-substituted propargylic acetates. The furan C3–C4 bond is presumably established by silyl enol ether attack at a propargylic cation intermediate. The resulting α-methoxyallene is intramolecularly substituted, leading to cyclization by displacement of the methoxy group (O–C2
标题化合物的汇集合成报道,其依赖于一个连续的2重S Ñ在甲氧基取代的丙炔乙酸盐'型取代反应。呋喃C3-C4键大概是通过甲硅烷基烯醇醚攻击炔丙基阳离子中间体而建立的。产生的α-甲氧基烯丙基被分子内取代,通过取代甲氧基基团(形成OC 2键)导致环化并同时形成环外烯烃双键。尽管条件相对温和,但反应在5分钟内完成。