An efficient synthetic strategy for the asymmetric synthesis of a hexahydrodibenzofuran core structure, with a quaternary stereogenic center, emerges by employing a chiral reduction using Corey's (S)-Me-CBS-oxazaborolidine reagent followed by a Mitsunobu reaction to set the stereochemistry. A Pd-mediated intramolecular Heck reaction concludes the tricyclic core structure. Finally, a Pd/C catalyzed reduction yields the target molecule in 21% overall yield over 6 steps.
通过使用 Corey 的
(S)-Me-CBS-oxazaborolidine 试剂进行手性还原,然后通过 Mitsunobu 反应来设定立体
化学,一种具有四元立体中心的六氢
二苯并呋喃核心结构的高效不对称合成策略应运而生。Pd 介导的分子内 Heck 反应最终形成了
三环核心结构。最后,在 Pd/C 催化下,通过 6 个步骤还原出目标分子,总产率为 21%。