Palladium-Catalyzed Carbonylation Reactions of Aryl Bromides at Atmospheric Pressure: A General System Based on Xantphos
作者:Joseph R. Martinelli、Donald A. Watson、Dominique M. M. Freckmann、Timothy E. Barder、Stephen L. Buchwald
DOI:10.1021/jo801279r
日期:2008.9.19
A method for the Pd-catalyzed carbonylation of aryl bromides has been developed usingXantphos as the ligand. This method is effective for the direct synthesis of Weinreb amides, primary and secondary benzamides, and methyl esters from the corresponding aryl bromides at atmosphericpressure. In addition, a putative catalytic intermediate, (Xanphos)Pd(Br)benzoyl, was prepared and an X-ray crystal structure
nickel-catalyzed aminocarbonylation of (hetero)aryl bromides was developed. The utilization of readily available oxamic acids, the application of a broadly used organic photoredox catalyst (4CzIPN), and mild reaction conditions make this transformation an appealing alternative to classical amidation procedures. The generation of carbamoyl radicals was supported by trapping reactions with a hydrogen
开发了一种用于(杂)芳基溴的光氧化还原和镍催化氨基羰基化的有效方法。利用容易获得的草酸、广泛使用的有机光氧化还原催化剂 (4CzIPN) 和温和的反应条件,使这种转化成为经典酰胺化程序的有吸引力的替代方案。在 D 2 O 存在下,通过与氢原子转移催化剂的捕获反应支持氨基甲酰基自由基的产生,产生氘代甲酰胺。对于各种草酸,证实了该氘化方案的通用性。
Visible-Light-Mediated Aerobic Oxidation of <i>N</i>-Alkylpyridinium Salts under Organic Photocatalysis
作者:Yunhe Jin、Lunyu Ou、Haijun Yang、Hua Fu
DOI:10.1021/jacs.7b07883
日期:2017.10.11
Quinolones and isoquinolones exhibit diverse biological and pharmaceutical activities, and their synthesis is highly desirable under mild conditions. Here, a highly efficient and environmentally friendly visible light-mediated aerobic oxidation of readily available N-alkylpyridinium salts has been developed with Eosin Y as the organic photocatalyst and air as the terminal oxidant, and the reaction