Synthetic study of hetisine-type aconite alkaloids. Part 1: Preparation of tetracyclic intermediate containing the C14–C20 bond
作者:Hideaki Muratake、Mitsutaka Natsume
DOI:10.1016/j.tet.2006.04.084
日期:2006.7
Full details for the total synthesis of (±)-nominine, a hetisine-type aconite alkaloid, are presented in three parts. Here (part 1), we describe the preparation of the key tetracyclic intermediate 6. Our palladium-catalyzed intramolecular α-arylation was adopted for preparation of the intermediate 4 with an angular formyl group. An acetal–ene reaction was then employed for C14–C20 bond formation to
分三部分介绍了(±)-代胺(一种hetisine型附子生物碱)的总合成的全部详细信息。在这里(第1部分),我们描述了关键的四环中间体6的制备。我们的钯催化的分子内α-芳基化被用于制备具有角甲酰基的中间体4。然后缩醛-烯反应物采用C14-C20键形成,以确保6从5。讨论了乙缩醛反应的反应机理,并开发了一种从6中除去2-羟乙基的方法。