Completely regioselective insertion of unsymmetrical alkynes into electron-deficient alkenes for the synthesis of new pentacyclic indoles
作者:Ke Chen、Ting Xu、Jian Liang、Meng Zhou、Jie Zhang、Wen-Juan Hao、Jianyi Wang、Shu-Jiang Tu、Bo Jiang
DOI:10.1039/c9cc08762a
日期:——
A Lewis acid-catalyzed insertion of unsymmetrical alkynes into electron-deficient alkenes was developed for the first time, and used to produce 34 hitherto unreported pentacyclic benzo[5,6]chromeno[2,3-b]indoles with generally good yields and complete stereoselectivity. A Yb(OTf)3-catalyzed reaction between o-alkynylnaphthols and 3-methyleneindolin-2-ones proceeded efficiently, and provided a simple
首次开发了路易斯酸催化的不对称炔烃插入缺电子烯烃中的方法,该方法用于生产34例迄今未报道的五环苯并[5,6] chromeno [2,3-b]吲哚,收率通常较高,而且完全立体选择性。Yb(OTf)3催化的邻炔基萘和3-亚甲基吲哚-2-酮之间的反应有效地进行,并通过无氧化剂的CC双键断裂/重排为炔烃双官能化提供了一个简单且收敛的方案。通过进行系统的理论计算,得出了该多米诺过程的机械细节。