Preparation of Bifunctional Allylboron Reagent and Application to Aldehyde Allylboration

Synthesis of a bifunctional allylboron reagent via Ni-catalyzed borylation of allylic acetate is reported. Subsequent allylation of aldehydes gave homoallylic alcohols in good yields. The allylsilane moiety in the alcohol product serves as a useful handle for subsequent transformations.