Journal of the American Chemical Society, Vol.133, No.51, 20750-20753, 2011
Stereodivergency in Catalytic Asymmetric Conjugate Addition Reactions of Glycine (Ket)imines
Stereodivergent catalytic asymmetric conjugate reactions of glycine (ket)imines with nitroalkenes have been achieved using various chiral catalyst systems derived from a multidentate amino alcohol (1). The stepwise nature of the [3 + 2] cycloaddition reactions of N-metalated azomethine ylides has also been demonstrated by highly enantio- and diastereoselective syntheses of exo-5 and endo-8 from the respective syn-4 and anti-7 conjugate addition products in a one-pot tandem fashion.