A synthesis of the taxane ring system is described. The A-ring moiety 5, containing the carbons for construction of the B-ring, was prepared from Wieland-Miescher ketone via Beckmann fragmentation of the oxime 10. The B-ring was formed by means of 12-membered lactam-sulfoxide ring contraction. The formation of the C-ring was carried out by aldol condensation of the resulting AB-ring moiety 3 followed by intramolecular pinacol coupling to give the tricyclic diol 23.
本文介绍了一种紫杉烷环系统的合成方法。A 环分子 5 含有用于构建 B 环的碳原子,由 Wieland-Miescher 酮通过肟 10 的贝克曼破碎法制备而成。B 环是通过 12 元内酰胺-亚砜环收缩形成的。C 环的形成是通过 AB 环分子 3 的醛醇缩合,然后通过分子内频哪醇偶联得到三环二醇 23。