Cobalt-Catalyzed Biaryl Couplings via C–F Bond Activation in the Absence of Phosphine or NHC Ligands
作者:Juan Wei、Kun-Ming Liu、Xin-Fang Duan
DOI:10.1021/acs.joc.6b02354
日期:2017.2.3
Co-catalyzed biaryl coupling through C–F cleavage under phosphine or NHC-free conditions was described. A broad range of aryl fluorides including unactivated fluorides as well as those with sensitive functionalities could couple with various Ti(OEt)4-mediated aryl Grignard reagents with high selectivity under the catalysis of CoCl2/DMPU. Importantly, selective C–F bond activation couplings between two types
描述了在膦或无NHC的条件下通过CF裂解产生的高度通用的选择性Co催化联芳基偶合。在CoCl 2 / DMPU的催化下,包括未活化的氟化物以及具有敏感功能的芳基氟化物在内的各种芳基氟化物都可以与各种Ti(OEt)4介导的芳基格利雅试剂进行高选择性的偶联。重要的是,还可以实现两种类型的氟之间的选择性CF键活化偶联(二氟芳族化合物和两个不同的偶联配偶体),并且在存在CCl或CBr键的情况下也可以实现。