Chemoselective Copper-Catalyzed Acylation of Benzothiazoles with Aryl Methyl Ketones
作者:Qiang Feng、Qiuling Song
DOI:10.1002/adsc.201400240
日期:2014.8.11
AbstractA copper(I) iodide‐catalyzed, highly efficient acylation of benzothiazoles with aryl methyl ketones as carbonyl sources under a nitrogen atmosphere was developed. This is an unprecedented protocol and an extremely efficient method for the selective synthesis of 2‐acylbenzothiazoles from commercially available, cheap starting materials with excellent chemoselectivity, good functional group tolerability and high turnover numbers (up to 14,200); also scaling up to 160 mmol without loss of the efficiency is possible. A variety of 2‐acylbenzothiazoles was smoothly prepared in good to excellent yields from aryl methyl ketones and benzothiazoles by a one‐pot domino protocol of combined sp3 CH oxidation, ring opening, and condensation.magnified image
Iron-catalyzed 2-acylbenzothiazole formation from aryl ketones and benzothiazoles using oxygen as oxidant
作者:Saiwen Liu、Ru Chen、Hui Chen、Guo-Jun Deng
DOI:10.1016/j.tetlet.2013.05.050
日期:2013.7
A convenient and efficient method for the synthesis of 2-acylbenzothiazoles from benzothiazoles and aromatic ketones using oxygen as oxidant is described. FeCl3·6H2O showed the best reactivity among the various iron salts investigated. Various functional groups were well tolerated under the optimized reaction conditions.