Asymmetric Friedel-Crafts Reaction of Indoles with Ethyl Trifluoropyruvate Using a Copper(I)-Bisoxazolidine Catalyst
作者:Christian Wolf、Peng Zhang
DOI:10.1002/adsc.201000918
日期:2011.3.28
Bisoxazolidine 1 is an effective ligand in the copper(I)‐catalyzed Friedel–Craftsreaction of alkyl trifluoropyruvates and indoles. A range of ethyl 2‐(3′‐indolyl)‐3,3,3‐trifluoro‐2‐hydroxypropanoates was produced in up to 99% yield and 94% ee within 30 min to 4 h. The effect of temperature on conversion and enantioselectivity proved to be substrate specific and was optimized individually. Of particular