Invertible Enantioselectivity in 6′-Deoxy-6′-acylamino-β-isocupreidine-Catalyzed Asymmetric Aza-Morita−Baylis−Hillman Reaction: Key Role of Achiral Additive
作者:Nacim Abermil、Géraldine Masson、Jieping Zhu
DOI:10.1021/ol901920s
日期:2009.10.15
(1e)-catalyzed aza-Morita−Baylis−Hillman reaction between N-sulfonylimines 3 and alkyl vinyl ketones 4 produced the (R)-enriched adducts 5. By adding a catalytic amount of β-naphthol (2a), the enantioselectivity of the same reaction was inversed leading to (S)-5 in excellent yields and enantioselectivities. Both aromatic and aliphatic imines are accepted as substrates for this reaction.
N-磺酰亚胺3和烷基乙烯基酮4之间的β-ICD(1a)或β-ICD-酰胺(1e)催化的aza-Morita-Baylis-Hillman反应产生了富含(R)的加合物5。通过添加催化量的β-萘酚(2a),相同反应的对映选择性相反,从而以优异的产率和对映选择性导致(S)-5。芳族和脂族亚胺均被接受为该反应的底物。