New Ligands for Enantioselective Recognition of Chiral Carboxylates Based on 1,1'-Binaphthalene-2,2'-diamine
作者:Ivan Stibor、Roman Holakovský、Asiya R. Mustafina、Pavel Lhoták
DOI:10.1135/cccc20040365
日期:——
Simple bis(arylureido)binaphthalenes and (arylamido)binaphthalenes have been synthesized in both racemic as well as optically active forms. One of these compounds has been found to complex chiral anions with modest enantioselectivity.
Development of axially chiral bis(arylthiourea)-based organocatalysts and their application in the enantioselective Henry reaction
作者:Xu-Guang Liu、Jia-Jun Jiang、Min Shi
DOI:10.1016/j.tetasy.2007.11.008
日期:2007.11
Axially chiral bis(arylthiourea)-based organocatalyst 6b, prepared from (R)-(+) - 5,5', 6,6', 7,7', 8,8'-octahydro-1,1'-binaph thy) 2,2'-diamine, was found to be an effective chiral organocatalyst for the enantioselective Henry reaction of arylaldehydes with nitromethane to give the corresponding adducts in moderate enantioselectivities and good yields. (c) 2007 Elsevier Ltd. All rights reserved.
Asymmetric Morita-Baylis-Hillman Reaction of Arylaldehydes with 2-Cyclohexen-1-one Catalyzed by Chiral Bis(Thio)urea and DABCO
作者:Min Shi、Xu-Guang Liu
DOI:10.1021/ol7028806
日期:2008.3.1
Novel bis(thio)urea organocatalysts were synthesized from axially chiral (R)-(-)-5,5',6,6',7,7',8,8'-octahydro-1,1'-binaphthyl-2,2'-diamine (H-8-BINAM), and their catalytic abilities have been examined in the Morita-Baylis-Hillman reaction of 2-cyclohexen-1-one or 2-cyclopenten-1-one with a wide range of aromatic aldehydes in combination with DABCO. The best result was achieved in the reaction of 3-fluorobenzaldehyde with 2-cyclohexen-1-one to give the desired Morita-Baylis-Hillman product in 79% yield and 88% ee.
Impact of Multiple Hydrogen Bonds with Fluoride on Catalysis: Insight from NMR Spectroscopy
作者:Francesco Ibba、Gabriele Pupo、Amber L. Thompson、John M. Brown、Timothy D. W. Claridge、Véronique Gouverneur
DOI:10.1021/jacs.0c09832
日期:2020.11.18
chemical reactions. Recently, enantioselective nucleophilic fluorination with metal alkali fluoride has been accomplished with BINAM-derived bisurea catalysts, presenting up to four NH hydrogen-bond donors (HBDs) for fluoride. These catalysts bring insoluble CsF and KF into solution, control fluoride nucleophilicity, and provide a chiral microenvironment for enantioselective fluoride delivery to the electrophile