作者:Xiao Yang、Rui Sun、Shun Li、Xueli Zheng、Maolin Yuan、Bin Xu、Weidong Jiang、Hua Chen、Haiyan Fu、Ruixiang Li
DOI:10.1021/acs.orglett.0c02413
日期:2020.9.18
A highly efficient and regioselective direct C–H trifluoromethylation of pyridine based on an N-methylpyridine quaternary ammonium activation strategy has been developed. A variety of trifluoromethylpyridines can be obtained in good yield and excellent regioselectivity by treating the pyridinium iodide salts with trifluoroacetic acid in the presence of silver carbonate in N,N-dimethylformamide. The
基于N-甲基吡啶季铵活化策略,开发了一种高效且区域选择性的吡啶直接CH H三氟甲基化方法。通过在N,N-二甲基甲酰胺中在碳酸银存在下用三氟乙酸处理碘化吡啶鎓盐,可以以良好的产率和优异的区域选择性获得各种三氟甲基吡啶。该协议具有良好的功能组兼容性,易于获得的起始材料以及操作简便的特点。对照实验表明,该反应可能涉及亲核三氟甲基化机理。