C(<i>sp</i><sup>2</sup>)–H Functionalization of 2<i>H</i>-Indazoles at C3-Position via Palladium(II)-Catalyzed Isocyanide Insertion Strategy Leading to Diverse Heterocycles
作者:Shinde Vidyacharan、Arumugavel Murugan、Duddu S. Sharada
DOI:10.1021/acs.joc.6b00048
日期:2016.4.1
2H-indazole at C3-position via an isocyanide insertion strategy for the synthesis of unprecedented benzoxazinoindazoles, indazoloquinaoxalines and benzoxazinoindazolones for the first time. Our new method provides an operationally simple and versatile route for a selective synthesis of 2-(2H-indazol-2-yl)phenols. Furthermore, we developed a sequential one-pot strategy for the synthesis of benzoxazinoindazolone
在本文中,我们首次报道了通过异氰酸酯插入策略在C3位上有效地Pd催化2 H-吲唑的C–H官能化,首次合成了前所未有的苯并恶嗪基吲唑,吲唑并喹喔啉和苯并恶嗪吲哚酮。我们的新方法为选择性合成2-(2 H-吲哚-2-基)苯酚提供了一种操作简单且通用的途径。此外,我们开发了一种在无金属氧化剂的条件下合成苯并恶嗪并吲哚酮的连续一锅策略。我们还实现了C(sp 2)–第一次是H和氧杂原子。本协议的关键特征是在一锅中构建4个键,合成新的骨架多样的支架,广泛的底物范围,高收率和环境友好的条件。