Synthesis of New Allocolchicinoids with Seven- and Eight-Membered B-Rings by Enyne Ring-Closing Metathesis
作者:François-Didier Boyer、Issam Hanna
DOI:10.1002/ejoc.200800595
日期:2008.10
functionality in the C-ring at the C10 or C11 positions, is reported. An asymmetric synthesis of (7S)-allocolchicine 5 is also described. The main features included the elaboration of a common intermediate, the AB bicyclic ring system, in which the construction of the seven-membered ring was achieved by an enyne ring-closing metathesis (RCM) reaction. A subsequent Diels–Alder/aromatization sequence afforded the
报告了别秋水仙碱 4 和 5 的全合成,在 C 环中的 C10 或 C11 位置具有酯官能团。还描述了 (7S)-allocolchicine 5 的不对称合成。主要特征包括对常见中间体 AB 双环系统的阐述,其中七元环的构建是通过烯炔闭环复分解 (RCM) 反应实现的。随后的 Diels-Alder/芳构化序列提供了一组具有高区域选择性的官能化环 C 别秋水仙素。该策略也用于合成含有八元 B 环的别秋水仙碱 6。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2008)