Synthesis of chiral iminoalkyl functionalised N-heterocyclic carbenes and their use in asymmetric catalysis
作者:Mahboub Merzouk、Theo Moore、Neil A. Williams
DOI:10.1016/j.tetlet.2007.10.049
日期:2007.12
A library of new chiral iminoalkyl imidazoliumsalts has been synthesised from amino acids using a modular design approach. Deprotonation with silver oxide yields silver carbene transfer reagents, which can be used as ligand sources in asymmetric catalysis. Preliminary testing has shown that the ligands induce enantioselectivity in the palladium-catalysed allylic alkylation of 1,3-diphenylprop-3-enyl
Synthesis of Amidoalkyl Imidazol-2-ylidene Ligands and Their Application to Enantioselective Copper-Catalysed Conjugate Addition
作者:Neil Williams、Theo Moore、Mahboub Merzouk
DOI:10.1055/s-2007-1000832
日期:2008.1
imidazol-2-ylidene ligand was synthesised via a two-step procedure starting from commercially available amino alcohols. Preliminary screening of these bidentate ligands for the enantioselective copper-catalysed conjugateaddition of diethyl zinc to cyclohexenone revealed some moderate ee values. Related chiral iminoalkyl imidazole-2-ylidene ligands demonstrated much poorer enantioselectivity. The results
A novel class of chiral-amine-functionalized ionic liquids (CAFILs) has been synthesized efficiently from natural amino acids, and their structures have been determined by spectroscopic analysis and low temperature X-ray diffraction analysis. The CAFILs have been characterized by physical properties such as melting point, glass transition temperature, thermal degradation and specific rotation. NMR measurements indicate that the CAFILs may be promising alternatives in the field of chiral discrimination. (c) 2006 Elsevier Ltd. All rights reserved.
HIRASHIMA, AKINORI;ETO, MORIFUSA, AGR. AND BIOL. CHEM., 1983, 47, N 4, 829-838