作者:Jiaqing Lu、Yuning Man、Yabin Zhang、Bo Lin、Qi Lin、Zhiqiang Weng
DOI:10.1039/c9ra07694h
日期:——
of 4-trifluoromethyl pyrazoles have been prepared via the copper-catalyzed cycloaddition of 2-bromo-3,3,3-trifluoropropene with a variety of N-arylsydnone derivatives under mild conditions. This new protocol under optimized reaction conditions [Cu(OTf)2/phen, DBU, CH3CN, 35 °C] afforded 4-trifluoromethyl pyrazoles in moderate to excellent yields with excellent regioselectivity.
在温和条件下,通过铜催化的 2-bromo-3,3,3-trifluoropropene 与多种N -arylsydnone 衍生物的环加成反应制备了一系列 4-三氟甲基吡唑。这种在优化反应条件 [Cu(OTf) 2 /phen, DBU, CH 3 CN, 35 °C] 下的新方案以中等至优异的产率和优异的区域选择性提供了 4-三氟甲基吡唑。