Synthetic studies of antitumor macrolide laulimalide: a stereoselective synthesis of the C17–C28 segment
作者:Arun K Ghosh、Yong Wang
DOI:10.1016/s0040-4039(00)00715-2
日期:2000.6
A stereoselective synthesis of the C17–C28 segment of the potent antitumor macrolide, laulimalide has been accomplished. The key steps are a ring-closing olefin metathesis to construct the dihydropyran unit, nucleophilic addition of an alkynyl anion to the Weinreb amide, stereoselective reduction of the resulting ketone to set the C20-hydroxyl stereochemistry, and elaboration of the C21–C22trans-olefin
强效抗肿瘤大环内酯月桂马内酯的C 17 –C 28片段的立体选择性合成已经完成。关键步骤是通过闭环烯烃复分解反应构建二氢吡喃单元、将炔基阴离子亲核加成到 Weinreb 酰胺、对所得酮进行立体选择性还原以设定 C 20 -羟基立体化学以及 C 21 –C的精细化22反式烯烃几何形状。