and carbethoxymethyl diphenylphosphine oxides with a range of O-protected chiral α-hydroxy aldehydes is described. The α-hydroxy aldehydes were prepared with high enantiomeric purity from chiral O-protected cyanohydrins. The γ-hydroxy-α,β-unsaturated compounds formed were isolated in high enantiomeric purity and excellent yield. In all cases complete E-selectivity was observed.
描述了
氰甲基和碳乙氧基甲基
二苯基膦氧化物与一系列O保护的手性α-羟基醛的霍纳-维蒂希反应。由手性O-保护的
氰醇制备具有高对映体纯度的α-羟基醛。分离出形成的γ-羟基-α,β-不饱和化合物,具有高对映体纯度和极佳的收率。在所有情况下,观察到完全的E-选择性。