Studies directed toward the total synthesis of pinnatoxin A: synthesis of the 6,5,6-dispiroketal (BCD ring) system by double hemiketal formation/hetero-Michael addition strategy
作者:Seiichi Nakamura、Jun Inagaki、Masashi Kudo、Tomohiro Sugimoto、Kohei Obara、Makoto Nakajima、Shunichi Hashimoto
DOI:10.1016/s0040-4020(02)01379-0
日期:2002.12
An efficient, highly stereoselective synthesis of the C10–C26 portion of pinnatoxin A has been achieved, wherein the key step is a highly stereoselective construction of the 6,5,6-dispiroketal (BCD ring) system by an intramolecular hetero-Michael addition of a hemiketal alkoxide reversibly formed under the influence of lithium methoxide.
品纳毒素A C10-C26部分的高效,高度立体选择性合成已经实现,其中关键步骤是通过分子内杂原子-迈克尔加成反应实现6,5,6-二螺酮(BCD环)系统的高度立体选择性构建。在甲醇锂的作用下可逆地形成的半烷醇盐。