derivatives 3a–f were conveniently prepared from trans-4-hydroxy-l-proline and applied to the catalytic enantioselective addition of diethylzinc to benzaldehyde and heptanal. Among them, 3d was found to show the best asymmetric induction in promoting the addition of Et2Zn to various aldehydes, providing (R)-secondary alcohols in up to 98% ee.
由
反式-4-羟基-1-脯
氨酸可方便地制备一系列手性(3 R,5 R)-二羟基
哌啶衍
生物3a - f,并将其用于催化
二乙基锌对
苯甲醛和
庚醛的对映选择性加成反应。其中,发现3d在促进Et 2 Zn向各种醛的添加中表现出最佳的不对称诱导作用,提供高达98%ee的(R)-仲醇。