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。
IntramolecularMichaelreaction of bis-α,β-unsaturated esters 1 forming 2 was carried out by the action of a trialkylsilyltrifluoromethanesulfonate in the presence of a tertiaryamine; the product was transformed into ricciocarpin A 8.
Structure of a novel lipid from the antibiotic diumycin
作者:W.A. Slusarchyk、J.A. Osband、F.L. Weisenborn
DOI:10.1016/s0040-4020(01)83385-8
日期:1973.1
The structures of diumycinol (1), isodiumycinol (2), and diumycene (3), the nonisoprenoid C25 lipids obtained by acid hydrolysis of the antibioticdiumycin, have been determined by analysis of spectral data and the identification of a number of degradation products. Examination of the ORD of a degradation product gave the absolute configuration of the asymmetric center in these compounds.