Enantioselective Friedel−Crafts Alkylation Reactions Catalyzed by a Chiral Nonracemic <i>C</i><sub>2</sub>-Symmetric 2,2‘-Bipyridyl Copper(II) Complex
作者:Michael P. A. Lyle、Neil D. Draper、Peter D. Wilson
DOI:10.1021/ol050075d
日期:2005.3.1
EnantioselectiveFriedel-Craftsalkylation reactions of a series of substituted indoles with methyl trifluoropyruvate, catalyzed by a chiral nonracemic C(2)-symmetric 2,2'-bipyridyl copper(II) triflate complex, are described. The corresponding 3,3,3-trifluoro-2-hydroxy-2-indole-3-yl-propionic acid methyl esters were formed in good yield and in high enantiomeric excess (up to 90%). This is the first
Rapid and convenient synthesis of aryl- and heteroaryl-α-hydroxy-α-trifluoromethyl acetate via Friedel–Crafts alkylation under solvent- and catalyst-free conditions
作者:Jun-Ling Zhao、Li Liu、Hai-Bo Zhang、Yan-Chao Wu、Dong Wang、Yong Jun Chen
DOI:10.1016/j.tetlet.2006.02.054
日期:2006.4
Solvent- and catalyst-free Friedel–Crafts alkylation reactions of aromatic and heteroaromatic compounds with methyl trifluoropyruvate (2) were carried out at room temperature and finished in several minutes with good to excellent yields of the addition products (69→99%), which provided a rapid and convenient method to synthesize aryl- and heteroaryl-α-hydroxy-α-triflouromethyl acetates.