Deconjugation of α,β-unsaturated esters and an intramolecular Michael reaction of bis-α,β-unsaturated esters with trialkylsilyl trifluoromethanesulfonate in the presence of tertiary amine: synthesis of (±)-ricciocarpin A
作者:Masataka Ihara、Shuichi Suzuki、Nobuaki Taniguchi、Keiichiro Fukumoto
DOI:10.1039/p19930002251
日期:——
1, 6 and 8 with trialkylsilyl trifluoromethanesulfonate in the presence of a tertiary amine gave, via silyl dienol ethers, the corresponding deconjugated esters 3, 7 and 9 as the major products, respectively. Reaction of bis-α,β-unsaturated esters 12a and 12b with a trialkylsilyl trifluoromethansulfonate in the presence of a tertiary amine caused an intramolecular Michael reaction to produce the cyclopentanes
的α,β -不饱和酯的治疗1,6和8中,在叔胺的存在下用三烷基甲硅烷三氟甲烷磺酸酯,得到,通过甲硅烷基烯醇醚,相应的去缀合酯3,7和9分别为主要产品。双-α,β-不饱和酯12a和12b与三烷基甲硅烷基三氟甲磺酸酯在叔胺存在下的反应引起分子内迈克尔反应,从而产生环戊烷14a和20a以及环己烷14b和20b。同时获得了由迈克尔-迪克曼串联或分子内狄尔斯-阿尔德反应形成的双环化合物21a和21b。将环己烷衍生物14b转化为倍半萜烯((±)-ricciocarpin A 22)的外消旋体。