Photogeneration of β-Borylsilyl Radical via Decarboxylation of <i>N</i>-Hydroxyphthalimide Esters

<i>Gem</i>-borylsilylalkanes are versatile intermediates in organic synthesis, and the traditional synthesis methods have mainly focused on metal reagents, the insertion reactions of diazo compounds, and hydrosilylation/hydroborylation reactions of unsaturated bonds. Herein, a novel, efficient <i>gem</i>-borylsilylalkanes synthesis via a radical approach is reported. This method introduced a β-<i>gem</i>-borylsilyl NHPI ester as the precursor of the β-borylsilyl radical that, coupling with radical acceptors under photo conditions, and the corresponding <i>gem</i>-borylsilylalkanes bearing unsaturated bonds, facilitate subsequent transformations.