The asymmetric conjugate addition of O-benzylhydroxylamine to α,β-unsaturated 3-acyloxazolidin-2-ones was smoothly catalyzed by the Sc(OTf)3/2,6-bis[(S)-4-isopropyloxazolin-2-yl]pyridine (i-Pr-pybox) complex in the presence of MS 4 Što give the corresponding β-amino acids in good conversions with high enantioselectivities (up to 91% ee).
O-
苄基羟胺与 α,β-不饱和 3-acyloxazolidin-2-ones 的不对称共轭加成由 Sc(OTf)3/2,6-bis[(S)-4-isopropyloxazolin-2-yl 顺利催化]
吡啶 (i-Pr-pybox) 复合物在 MS 4 Å 存在下以良好的转化率得到相应的β-
氨基酸,具有高对映选择性(高达 91% ee)。