The Asymmetric Synthesis of Polycyclic Tetrahydroxanthone via the Cascade Reaction of Alkene‐Substituted 1,3‐diketones and Alkenyloxindoles
作者:Rong Zhang、Wenhui Wang、Yonghui Zhang、Yushuang Chen、Weijun Yao、Zhen Wang
DOI:10.1002/adsc.202400113
日期:2024.4.23
An enantioselective access to polycyclic tetrahydroxanthone compounds was achieved through an organocatalyzed cascade reaction of alkene‐substituted 1,3‐diketones and alkenyloxindoles, using quinine‐derived squaramide as an efficient catalyst. It afforded a variety of optically active spirooxindole‐based tetrahydroxanthones with 18‐94% yields, >19:1 dr, and 86‐99% ee.
使用奎宁衍生的方酰胺作为有效催化剂,通过烯烃取代的 1,3-二酮和烯基羟吲哚的有机催化级联反应实现了多环四氢氧杂吨酮化合物的对映选择性合成。它提供了多种光学活性的基于螺吲哚的四氢氧杂蒽酮,产率为 18-94%,dr >19:1,ee 为 86-99%。