A general method for the synthesis of clerodane diterpenoids. Stereospecific total syntheses of (±)-15, 16-epoxy- -cleroda-3, 13(16), 14-triene and (±)-maingayic acid
作者:Takashi Tokoroyama、Kaoru Fujimori、Takayoshi Shimizu、Yoshiro Yamagiwa、Mitsugu Monden、Hideo Iio
DOI:10.1016/s0040-4020(01)90099-7
日期:——
representatives 11 and maingayic acid (32) in racemic forms are described. The common Δ4-3-octalone intermediates 2a and 2b were prepared from 3,4-dimethyl-2-cyclohexenone by a stereospecific conjugate addition-alkylation sequence and the subsequent thermodynamically controlled annelation. The dimethylcuprate addition to 2a followed by enolate trapping afforded stereospecifically the -alcohol 12, from which
已经开发了用于合成-和-环戊烷二萜的通用方法,并且描述了其在外消旋形式的代表11和主果酸(32)的总合成中的应用。公共Δ 4 -3- octalone中间体2a和2b是由立体有择共轭加成烷基化序列和随后的热力学控制的成环从3,4-二甲基-2-环己烯酮制备。向2a中添加二甲基铜酸酯,随后进行烯醇化物捕获,从而立体定向地获得了-醇12,由其合成了(±)-11。另一方面,2b的氢氰化得到-中间体33,然后它已被转化为(±)-麦角酸(32)。