Diastereoselective synthesis of antiquorin and related polyoxygenated atisene-type diterpenes
作者:Antonio Abad、Consuelo Agulló、Ana C. Cuñat、Ignacio de Alfonso Marzal、Antonio Gris、Ismael Navarro、Carmen Ramírez de Arellano
DOI:10.1016/j.tet.2006.11.083
日期:2007.2
approach to polyoxygenated atisene-type diterpenes starting from (S)-(+)-carvone is described. The key steps used in the preparation of the atisene framework are an intramolecular Diels–Alder reaction, an intramolecular diazoketone cyclopropanation, an endocyclic cyclopropane ring cleavage and the regioselective reduction of an allylic bromide by a low-valent chromium species. The synthesis of natural
描述了一种从(S)-(+)-香芹酮开始的非对映选择性方法合成多氧化的atisene型二萜。制备atisene骨架的关键步骤是分子内Diels-Alder反应,分子内重氮酮环丙烷化,环内环丙烷环裂解以及低价铬物质对区域性烯丙基溴的选择性还原。天然atisanes antiquorin(1),atis-16-ene-3,14-dione(3),atis-16-ene-2,3,14-trione(8)和3β-hydroxy-atis-16-的合成提出了遵循该方法的烯-2,14-二酮(9)。还描述了18-羟基-atis-16-烯-3,14-二酮的合成(5),该结构错误地分配给了从斐济植物大戟大戟(Euphorbia fidjiana)中分离出来的atisene。这项工作表明,从该植物中分离出来的天然大黄蜂实际上是该化合物C-4的差向异构体。