使用催化剂CuBr 2和氧化剂Ag 2 CO 3和K 2 S 2 O 8在与羧酸的有效反应中开发了吲哚与OXA的区域选择性直接C3-酯化反应。简单的实验程序被证明可广泛适用于一系列底物,包括芳香酸和脂肪酸,并且以高达 87% 的良好收率获得了相应的产物。同时为在相同反应条件下与苄基羧酸反应制备吲哚的C3-苄基衍生物提供了一种有价值的途径。
Cu‐Mediated Amination of (Hetero)Aryl C−H bonds with NH Azaheterocycles
作者:Jin‐Feng Yu、Jian‐Jun Li、Peng Wang、Jin‐Quan Yu
DOI:10.1002/anie.201910395
日期:2019.12.9
Direct synthesis of N-(hetero)arylated heteroarenes has been realized through Cu-mediated C-N coupling of NH azaheterocycles with aryl C-Hbonds under aerobic conditions. This method features a broad scope of both heterocyclic arenes (pyridine, quinoline, pyrazole, imidazole, furan, thiophene, benzofuran, and indole) and NH azaheterocycles (imidazole, pyrazole, indole, azindole, purine, indazole, benzimidazole
Cu(II)-promoted ortho alkynylation of arenes and heteroarenes with terminal alkynes has been developed to prepare aryl alkynes. A variety of arenes and terminal alkynes bearing different substituents are compatible with this reaction, thus providing an alternative disconnection to Sonogashira coupling.
Cu(OAc)<sub>2</sub>-Catalyzed Coupling of Aromatic C–H Bonds with Arylboron Reagents
Cu-catalyzed coupling of aryl C-H bonds with arylboron reagents was accomplished using a readily removable directing group, which provides a useful method for the synthesis of biaryl compounds. The distinct transmetalation step in this Cu-catalyzed C-H coupling with aryl borons provides unique evidence for the formation of an aryl cupperate intermediate.