作者:Vanessa Miranda、Christopher D. Maycock、M. Rita Ventura
DOI:10.1002/ejoc.201501002
日期:2015.12
6S)-dimethoxy-2,3-dimethyl-1,4-dioxane-5,6-dithiocarboxylate using 4-benzyloxybenzyl bromide stereoselectively gave two new stereogenic centres with the carboxylate groups in a cis relationship. Hydrolytic deprotection of this intermediate produced the natural product (+)-piscidic acid. Installation of a cinnamic acid ester at the secondary hydroxy group was followed by selective deprotection to give a mixture
使用 4-苄氧基苄基溴对 (2S,3S,5S,6S)-二甲氧基-2,3-二甲基-1,4-二氧六环-5,6-二硫代羧酸锂的烯醇化锂进行立体选择性的烷基化,得到两个带有羧酸根的新立体中心在顺式关系中。该中间体的水解脱保护产生天然产物 (+)-鱼腥草酸。在仲羟基上安装肉桂酸酯,然后选择性脱保护,得到比例为 3:1 的顺式/反式肉桂酸酯混合物。最终得到天然产物升麻酸L。