Highly Enantioselective FriedelâCrafts Reaction of Indole with Alkylidenemalonates Catalyzed by Heteroarylidene Malonate-Derived Bis(oxazoline) Copper(II) Complexes
作者:Yan-Jin Sun、Nan Li、Zhong-Bo Zheng、Lei Liu、Yan-Bo Yu、Zhao-Hai Qin、Bin Fu
DOI:10.1002/adsc.200900669
日期:2009.12
A series of cheap and easily accessible heteroarylidenemalonate-derived bis(oxazoline) ligands 1 and 2 were synthesized and their copper(II) complexes were applied to the catalytic Friedel–Crafts reaction between indoles and diethyl alkylidenemalonates, Excellent asymmetric enantioselectivities were afforded for the S-enantiomer (up to >99% ee) in isobutyl alcohol, and the R-enantiomer (up to 96.5%