The firstcatalytic enantioselective Roskamp reaction of alpha-alkyl-alpha-diazoesters with aromaticaldehydes was realized using a simple chiral N,N'-dioxide-scandium(III) complex. Remarkably, with 0.05 mol % catalyst, the reaction was performed well over a series of substrates, giving the desired products chemoselectively in excellent yields (up to 99%) and enantioselectivities (up to 98% ee) under
A New Catalytic Conjugate Addition/Aldol Strategy That Avoids Preformed Metalated Nucleophiles
作者:Kandasamy Subburaj、John Montgomery
DOI:10.1021/ja0362048
日期:2003.9.1
A new conjugateaddition/aldol strategy has been developed. Unlike conventional procedures that require metalation of the nucleophilic species, the procedure allows the direct coupling of aryl iodides, aldehydes, and acrylates in a nickel-catalyzed, organozinc-promoted process.