Application of the Photoredox Coupling of Trifluoroborates and Aryl Bromides to Analog Generation Using Continuous Flow

    • Travis J. DeLano, Upul K. Bandarage, Natalie Palaychuk, Jeremy Green, and Michael J. Boyd
    • Vertex Pharmaceuticals Incorporated, 50 Northern Avenue, Boston, Massachusetts 02210, United States

    A method for the coupling of aryl bromides with potassium alkyl trifluoroborates, via nickel/photoredox dual catalysis, has been developed for use in continuous flow. This operationally simple protocol is able to form Csp3–Csp2 bonds with significantly reduced reaction times and a broader substrate scope than when conducted in batch. The utility of this method for rapid analog synthesis has been demonstrated by the synthesis of a small library of alkyl-substituted quinazolines.

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