First asymmetric synthesis of the naturally occurring epoxy noneolide stagonolide-D has been reported in this article. Ring-closing metathesis (RCM) by Grubbs second generation catalyst, Sharpless asymmetric epoxidation (SAE), and cis-selective Horner–Wadsworth–Emmons (HWE) olefination by Ando method are the key reactions successfully employed to achieve the target molecule in a divergent approach. Structurally related small ring macrolide stagonolide-G has also been synthesized by employing RCM and a metal–enzyme combined dynamic kinetic resolution (DKR) strategy starting from (S)-ethyl lactate as a chiral pool.
本文报道了天然环氧noneolide stagonolide-D的首次非对称合成。该合成通过使用第二代Grubbs催化剂的环合复分解(RCM)、Sharpless非对称环氧化(SAE)以及由Ando方法进行的顺式选择性Horner-Wadsworth-Emmons(HWE)烯化反应,成功地采用发散性途径合成了目标分子。从手性池来源的(S)-
乳酸乙酯出发,利用RCM和
金属-酶联合动态动力学拆分(DKR)策略,还合成了结构相关的小环大环内酯stagonolide-G。