[reaction: see text] The enantioselective copper(II)-catalyzed Friedel-Crafts addition of indoles to N-sulfonyl aldimines was developed using chiral bisoxazoline as ligands, and high enantioselectivities (up to 96% ee) were achieved.
Highly enantioselective Friedel–Crafts reaction of indoles with N-sulfonyl aldimines catalyzed by heteroarylidene malonate-type bis(oxazoline) copper(II) complexes
作者:Lei Liu、Qiuying Zhao、Fengpei Du、Hongliang Chen、Zhaohai Qin、Bin Fu
DOI:10.1016/j.tetasy.2011.10.017
日期:2011.11
The enantioselective Friedel–Crafts addition of indoles to N-sulfonyl aldimines was studied using a heteroarylidene malonate-type bis(oxazoline) as a chiral ligand. High to excellent enantioselectivities (up to >99% ee) were achieved using the complex of copper(II)–L1b with a benzyl group. The effects of ligand structure, solvent, temperature and substrate on the reaction were also investigated.