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A direct, mild, and general method for the enantioselective allylsilylation of aldehydes with allyl chlorides is reported. The reactions are effectively catalyzed by 5 mol % of n-Bu 4 NBr, and this rate acceleration allows the use of complex allyl donors in fragment-coupling reactions and of electron-deficient allyl donors. The results are (1) significant progress toward a "universal" asymmetric aldehyde allylation reaction that can reliably and highly stereoselectively couple any allyl chloride_aldehyde combination and (2) the discovery of a novel mode of nucleophilic catalysis for aldehyde allylsilylation reactions.

Direct, Mild, and General n-Bu4NBr-Catalyzed Aldehyde Allylsilylation with Allyl Chlorides

Direct, Mild, and General n-Bu₄NBr-Catalyzed Aldehyde Allylsilylation with Allyl Chlorides