Abstract
Stereoselective synthesis of γ,δ-bifunctionalized homoallylic alcohols and ethers via chemoselective allylation is reported. Pd-catalyzed 1,2-diboration of allenylsilane provided a novel 1,1,2-trifunctional allylation reagent. Allylboration of aldehydes with the reagent followed by in situ protection gave TES-protected homoallylic alcohols with excellent Z-selectivities. Chemoselective allylsilation with the same reagent delivered γ,δ-bifunctionalized homoallylic ethers with high E-selectivities. The bifunctionalized alkene group in the products underwent various transformations without erosion of the olefin geometry.
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