Effect of chirality of small molecule organofluorine inhibitors of amyloid self-assembly on inhibitor potency
摘要:
The effect of enantiomeric trifluoromethyl-indolyl-acetic acid ethyl esters on the fibrillogenesis of Alzheimer's amyloid beta (A beta) peptide is described. These compounds have been previously identified as effective inhibitors of the A beta self-assembly in their racemic form. Thioflavin-T Fluorescence Spectroscopy and Atomic Force Microscopy were applied to assess the potency of the chiral target compounds. Both enantiomers showed significant inhibition in the in vitro assays. The potency of the enantiomeric inhibitors appeared to be very similar to each other suggesting the lack of the stereospecific binding interactions between these small molecule inhibitors and the A beta peptide. (C) 2009 Elsevier Ltd. All rights reserved.
EnantioselectiveFriedel–Craftsalkylations of a variety of indoles with ethyl 3,3,3-trifluoropyruvate catalyzed by novel chiral m-phenylenebis(imidazoline)-copper(II) complexes or the bis(imidazoline)-achiral acid combination afforded products with high enantioselectivity. Both enantiomers of indole derivatives can be prepared with high enantioselectivities by tuning the N-substituents of the imidazoline
Asymmetric Calcium Catalysis: Highly Enantioselective Carbonyl-Ene and Friedel-Crafts Reactions for the Synthesis of Quaternary α-Hydroxy Esters Bearing a Trifluoromethyl Group
Enantioselectivecalcium‐catalyzed addition reactions of styrene and indole derivatives with trifluoropyruvates have been developed. The alkaline‐earth metal‐catalyzed reactions proceed smoothly to afford the corresponding products in high yields and with good to excellent enantioselectivities under mild reaction conditions.
Enantioselective Friedel-Crafts alkylation of indoles with trifluoropyruvates catalyzed by chiral Cu(II) complex bearing binaphthyl-proline hybrid ligands
作者:Chao Yao、Jiaqi Hou、Qihang Cai、Yaoqi Chen、Chao Wang、Jiemian Liang、Zilin Jiao、Lin Li、Yue-Ming Li
DOI:10.1016/j.tet.2024.133874
日期:2024.3
A mild and efficient catalyst system for asymmetric Friedel-Crafts alkylation of indoles with trifluoropyruvates was reported. The chiral ligands took the advantages of both the proline and the binaphthyl moieties, and the in situ prepared Cu(II) catalyst showed good substrate tolerance in the reactions. Indoles bearing different substituents could be tolerated, and the desired products could be obtained