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  • Selective C(sp3)−H and C(sp...
    Mao, Yang‐Jie; Lou, Shao‐Jie; Hao, Hong‐Yan; Xu, Dan‐Qian

    Angewandte Chemie International Edition, October 22, 2018, Volume: 57, Issue: 43
    Journal Article

    Selective introduction of fluorine into molecules by the cleavage of inert C−H bonds is of central academic and synthetic interest, yet remains challenging. Given the central role of alcohols in organic chemistry as the most ubiquitous building blocks, a versatile and selective C(sp3)−H and C(sp2)−H fluorination of simple alcohols, enabled by novel designed exo‐directing groups, is described. C(sp2)−H bond fluorination was achieved by using a simple acetone oxime as auxiliary, whereas a new, modular and easily accessible bidentate auxiliary was developed for the efficient and site‐selective fluorination of various primary methyl, methylene, and benzylic C(sp3)−H bonds. Fluorinated alcohols can readily be accessed by the removal of auxiliaries, and significantly expands the synthetic prospect of the present procedure. A versatile and selective C(sp3)−H and C(sp2)−H fluorination of simple alcohols, enabled by an exo‐directing group (DG) is described. C(sp2)−H bond fluorination was achieved by using simple acetone oxime as an auxiliary, whereas a new and modularly accessible bidentate auxiliary was developed for the efficient and site‐selective fluorination of C(sp3)−H bonds. The auxiliary is removable and demonstrates broad substrate scope and excellent selectivity.