A facile and efficient method to produce optically pure benzofuroindolines, especially those without 3‐substituents that are susceptible to rearomatization, through [3+2] annulation of indoles with quinones is described. The suitable combination of a BOX ligand CuII hydrate complex and freshly activated molecular sieves functions to give controllably dynamic release of water, which enables the success
描述了一种简便有效的方法,可通过
吲哚与
吲哚的[3 + 2]环化生产光学纯的
苯并呋喃二氢
吲哚,特别是没有3-取代基的
苯并呋喃二氢
吲哚。BOX
配体Cu II
水合物和新鲜活化的
分子筛的适当组合可起到可控地动态释放
水的作用,从而使该反应成功。该反应可以以克规模进行,催化剂负载量仅为0.5mol%。