Carbene-Catalyzed Formal [5 + 5] Reaction for Coumarin Construction and Total Synthesis of Defucogilvocarcins
作者:Xuan Huang、Tingshun Zhu、Zhijian Huang、Yuexia Zhang、Zhichao Jin、Giuseppe Zanoni、Yonggui Robin Chi
DOI:10.1021/acs.orglett.7b03102
日期:2017.11.17
An N-heterocyclic carbene-catalyzed formal [5 + 5] reaction between enals and furanones that generates multisubstituted coumarins in a single step is reported. Five atoms in each of the substrates are involved in this catalytic process to form a benzene and a lactone ring. The power of the method is further demonstrated in metal-free total syntheses of several natural products (defucogilvocarcins M
据报道,在烯醛和呋喃酮之间的N杂环卡宾催化的正式[5 + 5]反应可在一个步骤中生成多取代的香豆素。每个底物中的五个原子参与该催化过程以形成苯和内酯环。该方法的功效在以香豆素为关键结构基序的几种天然产物(去甲福尔霉素M,E和V)的无金属全合成中得到了进一步证明。