A diastereomer of iriomoteolide 1a has been synthesized as part of our effort to identify the so far unknown stereochemical structure of the natural product. The synthetic route features a lithium acetylide-chloroformate coupling, the ring-closing metathesis to form the macrocyclic diolide, and a SmI2-mediated intramolecular reductive allylation for formation of the cyclic hemiketal.
作为我们努力鉴定迄今为止未知的
天然产物立体
化学结构的一部分,已经合成了 iriomoteolide 1a 的非对映异构体。该合成路线的特点是
乙炔锂-
氯甲酸酯偶联、闭环复分解形成大环二内酯,以及
SmI2介导的分子内还原烯丙基化形成环状半
缩酮。