An Approach to the Stereoselective Synthesis of Nidifocene. II. Total Synthesis of (.+-.)-Dehalogenonidifocene.
作者:Kazuyuki MIYASHITA、Koji YONEDA、Tomohiro AKIYAMA、Yasuo KOGA、Ryozo TOKURA、Yoko ABE、Tomoko KUME、Chuzo IWATA
DOI:10.1248/cpb.41.458
日期:——
The total synthesis of (±)-dehalogenonidifocene (3), a potential key intermediate for the total synthesis of(±)-nidifocene (1), is described, in which the key steps are the construction of the basic tricyclic skeleton and the regioselective introduction of the double bond. Construction of the tricyclic skeleton could be achieved by the intramolecular Michael-type addition of the hydroxyl group of the exo-methylene compound 6, and the reduction of the conjugated diene moiety of 9 with ytterbium in liqud ammonia afforded the target molecule in a regioselective manner.
本文描述了(±)-dehalogenonidifocene (3)的全合成过程,(±)-neidifocene (1)全合成的潜在关键中间体,其中的关键步骤是基本三环骨架的构建和双键的区域选择性引入。三环骨架可通过外亚甲基化合物 6 的羟基的分子内迈克尔型加成来构建,而在液氨中用镱还原 9 的共轭二烯分子,则可通过区域选择性的方式得到目标分子。