Intramolecular Heck cyclization to the galanthamine-type alkaloids: total synthesis of (±)-lycoramine
作者:Pi-Hui Liang、Jing-Ping Liu、Ling-Wei Hsin、Chen-Yu Cheng
DOI:10.1016/j.tet.2004.09.044
日期:2004.12
A novel approach towards the construction of the galanthamine skeleton was demonstrated by the total synthesis of (±)-lycoramine. The key steps include a Pd-catalyzed intramolecular cyclization to form the seven-membered azepane ring and a spontaneous intramolecular Michael addition to afford the five-membered furan ring. This synthetic route has also been demonstrated to be useful for the preparation
(±)-lycoramine的全合成证明了一种构造加兰他敏骨架的新颖方法。关键步骤包括钯催化的分子内环化反应以形成七元氮杂环戊烷环和自发的分子内迈克尔加成反应以提供五元呋喃环。该合成途径也已被证明可用于制备具有简化的加兰他敏骨架的新型衍生物。