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.
Enantioselective inhibition of reverse transcriptase (RT) of HIV-1 by non-racemic indole-based trifluoropropanoates developed by asymmetric catalysis using recyclable organocatalysts
Herein, we report the development of efficient inhibitors of reverse transcriptase (RT) of HIV-1 based on indole-alkyl trifluoropyruvate derivatives by a TZM-bl cell assay. The inhibitory activities of the two enantiomers and the corresponding racemic mixture have been compared. TZM-bl cells exhibited strong enantioselective discrimination for the (R)-configuration, among these indole derivatives, the most active compound R-12, with a 5-NO2 substituent, gave the best result when tested in the TZM-bl cells on HIV virus type HIV-1IIIB, with an EC50 value of 0.019 μM, CC50 value of 210.697 μM and SI (selectivity index, CC50/EC50) value of 11 089, respectively. The cell test showed that, in most cases, the R-enantiomer was superior to the Rac-mixture, which was better than the corresponding S-enantiomer. The results indicated that the R-enantiomer is the most favorable configuration as an efficient HIV-1 inhibitor. Molecular modeling studies suggested a structural basis for the enantioselectivity of RT towards this class of molecules.