Synthesis of α-Haloboronates by the Halogenation of gem -Diborylalkanes via Tetracoordinate Boron Species.

α-Haloboronates have a wide range of applications in organic chemistry as synthetic synthons; however, traditional synthetic methods of α-haloboronates are harsh and complicated. Herein, we used n BuLi as the nucleophilic reagent to attack the boron atom in gem- diborylalkanes to form tetracoordinate boron species and successfully achieved α-chloroboronates and α-bromoboronates with readily accessible electrophilic halogen reagents (NCS and NBS). The reaction is transition-metal-free and features a broad substrate scope and diversified valuable products.