A practical 13-step synthesis of the title compounds suitable for the gram scale has been developed. Key steps are Sharpless resolution, Claisen rearrangement, epoxidation and intramolecular SN2 ring closure to form the pyrrolizidine system.
我们开发出了一种适用于克级规模的 13 步标题化合物实用合成法。关键步骤包括 Sharpless 解析、Claisen 重排、环氧化和分子内 SN2 闭环,从而形成
吡咯烷系统。