Synthesis of Silylated Alkylboronic Acids and Esters via Hydroboration of Allylic and Vinylic Trimethylsilanes

摘要

Representative allylic trimethylsilanes and isopropenyltrimethylsilane were hydrobo-rated with dichloroborane,and the products were transformed into the corresponding beta-or gamma-trimethylsilylboronates.Synthesis of 2-trimethylsilylethylboronic acid and its diethyl ester via hydroboration of trimethylvinylsilane with diisopinocampheylborane,followed by liberation of alpha-pinene is described.