CuI–Fesulphos complexes: efficient chiral catalysts for asymmetric 1,3-dipolar cycloaddition of azomethine ylides
作者:Silvia Cabrera、Ramón Gómez Arrayás、Belén Martín-Matute、Fernando P. Cossío、Juan C. Carretero
DOI:10.1016/j.tet.2007.03.130
日期:2007.7
The Cu-I-Fesulphos catalyst system (<= 3 mol %) shows an excellent performance in the asymmetric 1,3-dipolar cycloaddition of azomethine ylides. High to very high levels of reactivity, endo/exo selectivity, and enantioselectivity ( 69->99% ee) are generally achieved with a very wide range of azomethine ylides and dipolarophiles. Based on experimental and computational studies data, a model that accounts for this high enantiocontrol is proposed. (c) 2007 Elsevier Ltd. All rights reserved.