Decarboxylative Trifluoromethylating Reagent [Cu(O<sub>2</sub>
CCF<sub>3</sub>
)(phen)] and Difluorocarbene Precursor [Cu(phen)<sub>2</sub>
][O<sub>2</sub>
CCF<sub>2</sub>
Cl]
作者:Xiaoxi Lin、Chuanqi Hou、Haohong Li、Zhiqiang Weng
DOI:10.1002/chem.201504306
日期:2016.2.5
exhibited a linear relationship and a reaction parameter (ρ)=+0.56±0.02, which indicated that the trifluoromethylation reaction proceeded via a nucleophilic reactive species. Complex 2 reacts with phenols to produce aryl difluoromethyl ethers in modest‐to‐excellent yields. Mechanistic investigations revealed that the difluoromethylation reaction proceeds by initial copper‐mediated formation of difluorocarbene
本文介绍了一种新型的经济型脱羧三氟甲基化试剂[Cu(phen)(O 2 CCF 3)](1 ; phen = 1,10-菲咯啉)和有效的二氟卡宾前体[Cu(phen)2 ] [O 2 CCF 2 Cl ](2)。用苯酚处理叔丁醇铜,然后加入三氟乙酸或氯二氟乙酸,分别提供了空气稳定的络合物1和2,其特征在于X射线晶体学分析。在铜(I)离子1由二齿配位体啉,单齿三氟乙基,和CH的分子配位扭曲的四面体配位几何形状的3 CN。的分子结构2采用的是由一个的离子形式[铜(phen)的2 ] +阳离子和氯二氟乙一个阴离子。配合物1与各种芳基和杂芳基卤化物反应以高收率形成三氟甲基(杂)芳烃。相应的哈米特图显示出线性关系和反应参数(ρ)= + 0.56±0.02,这表明三氟甲基化反应是通过亲核反应性物质进行的。复杂2与酚反应生成芳基二氟甲基醚,产率中等至优异。机理研究表明,二氟甲基化反应是通过最初的铜介导的