Copper-Catalyzed β-Boration of α,β-Unsaturated Carbonyl Compounds with Tetrahydroxydiborane
摘要:
The copper-catalyzed beta-boration of alpha,beta-unsaturated carbonyl compounds with tetrahydroxydiborane has been developed. This diboron reagent allows direct, efficient access to boronic acids and their derivatives. Primary, secondary, and tertiary alpha,beta-unsaturated amides are converted to the corresponding beta-trifluoroboratoamides in good to excellent yields. The beta-boration of a variety of alpha,beta-unsaturated esters and ketones is also reported.