Highly enantioselective Friedel–Crafts alkylation of indoles and pyrrole with β,γ-unsaturated α-ketoesters catalyzed by heteroarylidene-tethered bis(oxazoline) copper complexes
作者:Lei Liu、Hongli Ma、Yumei Xiao、Fengpei Du、Zhaohai Qin、Nan Li、Bin Fu
DOI:10.1039/c2cc34803a
日期:——
The simple and cheap chiral catalyst, heteroarylidene-tethered Ph-bis(oxazoline)-Cu(OTf)(2), can efficiently catalyze the asymmetric F-C alkylation of indoles and pyrrole with beta,gamma-unsaturated alpha-ketoesters. The 3-indolyl adducts were obtained in up to >99% ee. Moreover, the 2-pyrrolyl adducts were achieved in up to 92% ee for the first time.