Total Synthesis and Absolute Configuration Assignment of MRSA Active Garcinol and Isogarcinol
作者:Cecilia Socolsky、Bernd Plietker
DOI:10.1002/chem.201406077
日期:2015.2.9
A short total synthesis of (±)‐garcinol and (±)‐isogarcinol, two endo‐type B PPAPs with reported activity against methiciline resistant Staphylococcus aureus (MRSA), is presented. The separation of framework‐constructing from framework‐decorating steps and the application of two highly regio‐ and stereoselective Pd‐catalysed allylations, that is, the Pd‐catalysed decarboxylative Tsuji–Trost allylation
简要介绍了(±)-藤黄酚和(±)-异丁香酚这两种内消旋B型PPAP的短合成过程,据报道它们具有对耐甲氧西林的金黄色葡萄球菌(MRSA)的活性。将框架构建步骤与框架装饰步骤分离,并应用两种高度区域选择性和立体选择性的Pd催化烯丙基化,即Pd催化的脱羧Tsuji-Trost烯丙基化和非对映选择性Pd催化的烯丙基-烯丙基交叉偶联是允许从乙酰丙酮开始的13个步骤内完成总合成的关键元素。对映体分离后,四种天然产物的绝对构型(即(-)-藤黄醇,(+)-guttiferone E(即ent-garcinol),( - ) - isogarcinol,和(+) - isoxanthochymol(即,耳鼻喉科-isogarcinol))是基于ECD光谱分配。