Stereospecific Syntheses of the Lignans: 2-S-(3,4-Dimethoxybenzyl)-3-R-(3,4,5-trimethoxybenzyl) Butyrolactone, and Its Positional Isomeric Lactone
作者:Alírica Suárez、Francisco López、Reinaldo S. Compagnone
DOI:10.1080/00397919308009859
日期:1993.7
Abstract A short, versatile and stereospecific synthesis of two lignans 1 and 2, was achieved in 40% overall yield. Our strategy was based in the use of amino acids as chiral and readily available starting materials. Stereocontroled transformation of amino acids to chiral organic phosphonates gave the key intermediate of the synthetic sequence. A Horner-Wadsworth-Emmons (HWE) reaction followed by selective