Total Synthesis of (+)-Isoschizandrin Utilizing a Samarium(II) Iodide-Promoted 8-Endo Ketyl−Olefin Cyclization
作者:Gary A. Molander、Kelly M. George、Lauren G. Monovich
DOI:10.1021/jo0347361
日期:2003.12.1
The 13-step synthesis of (+)-isoschizandrin reported herein features a samarium(II) iodide-promoted 8-endo ketyl-olefin coupling to assemble the eight-membered ring present in the target concomitantly with the required functionality and stereochemistry. In constructing (+)-isoschizandrin as a single atropisomer, the synthesis utilizes a kinetic resolution of a seven-membered lactone using a CBS-oxazaborolidine
本文报道的(+)-异五味子素的13个步骤的合成具有碘化sa(II)促进的8-内基酮基-烯烃偶联,以组装存在于靶中的八元环以及所需的功能性和立体化学。在构建作为单一阻转异构体的(+)-异五味子素中,合成过程利用CBS-恶唑硼烷定律利用了七元内酯的动力学拆分。