Catalytic asymmetric Roskamp reaction of alpha-alkyl-alpha-diazoesters with aromatic aldehydes: highly enantioselective synthesis of alpha-alkyl-beta-keto esters.
The first catalytic enantioselective Roskamp reaction of alpha-alkyl-alpha-diazoesters with aromatic aldehydes was realized using a simple chiral N,N'-dioxide-scandium(III) complex. Remarkably, with 0.05 mol % catalyst, the reaction was performed well over a series of substrates, giving the desired products chemoselectively in excellent yields (up to 99%) and enantioselectivities (up to 98% ee) under mild conditions. This protocol provides a promising method for the synthesis of chiral alpha-alkyl-beta-keto esters and 1,3-diols.
Li
Wei
W
Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu 610064, PR China.
Wang
Jun
J
Hu
Xiaolei
X
Shen
Ke
K
Wang
Wentao
W
Chu
Yangyang
Y
Lin
Lili
L
Liu
Xiaohua
X
Feng
Xiaoming
X