Nickel-Catalyzed Alkyl-Alkyl Cross-Couplings of Fluorinated Secondary Electrophiles: A General Approach to the Synthesis of Compounds having a Perfluoroalkyl Substituent
作者:Yufan Liang、Gregory C. Fu
DOI:10.1002/anie.201503297
日期:2015.7.27
to a tertiary carbon atom by using an alkyl–alkyl cross‐coupling. A nickel catalyst derived from NiCl2⋅glyme and a pybox ligand achieves the coupling of a wide range of fluorinated alkyl halides with alkylzinc reagents at room temperature. A broad array of functional groups is compatible with the reaction conditions, and highly selective couplings can be achieved on the basis of differing levels of
氟化有机分子在药物化学到聚合物科学等领域都令人感兴趣。本文描述的是一种温和,方便且通用的方法,该方法通过使用烷基-烷基交叉偶联来合成带有连接至叔碳原子的全氟烷基的化合物。源自NiCl 2的镍催化剂乙二醇和pybox配体可在室温下实现多种氟化烷基卤与烷基锌试剂的偶联。各种各样的官能团与反应条件相容,并且基于不同的氟化水平可以实现高度选择性的偶联。机理研究表明,在这些条件下2,2,6,6-四甲基-1-哌啶基氧基(TEMPO)的存在会抑制交叉偶联,并且可以分离出TEMPO-亲电子加合物。