Organocatalysis with a Fluorous Tag: Asymmetric Reduction of Imines with Trichlorosilane Catalyzed by Amino Acid-Derived Formamides
作者:Andrei V. Malkov、Marek Figlus、Sigitas Stončius、Pavel Kočovský
DOI:10.1021/jo062215i
日期:2007.2.1
Asymmetric reduction of ketimines 1 with trichlorosilane can be catalyzed by N-methylvaline-derived Lewis-basic formamides 3a−d with high enantioselectivity (≤95% ee) and low catalyst loading (1−5 mol %) at room temperature in toluene. Appending a fluorous tag, as in 5a−c, simplifies the isolation procedure, while preserving high enantioselectivity (≤92% ee).
在室温下,N-甲基缬氨酸衍生的路易斯碱性甲酰胺3a - d在室温下在甲苯中具有高的对映选择性(≤95%ee)和低的催化剂负载量(1-5%mol),可催化三氯硅烷对酮亚胺1的不对称还原。如5a - c所示,附加一个荧光标签可简化分离过程,同时保留高对映选择性(≤92%ee)。