Controlled Synthesis of α‐Mono‐ and α,α‐Di‐Halogenated Ketones Through Coupling of Halogenated Diboromethanes with Carboxylic Acid Esters

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Halogenated gem‐diboron reagents, as structurally unique gem‐diborylalkanes, are crucial in organic synthesis chemistry. Herein, we report a strategy with controlled synthesis of α‐mono‐ and α,α‐di‐halogenated ketones through nucleophilic addition reaction of halogenated diboromethanes with carboxylic acid esters. The substrate scope is broad and the nucleophilic addition reaction proceeds from a diverse range of carboxylic acid esters with bromo‐ or chloro‐diborylmethanes. Moreover, an intriguing heterocyclic compound has been serendipitously synthesized as well.