Amino-sugar modular ligands—useful cores for the formation of asymmetric copper 1,4-addition catalysts
作者:Antonella De Roma、Francesco Ruffo、Simon Woodward
DOI:10.1039/b813137f
日期:——
Modular phosphine ligands, synthesised rapidly from commercial N-acetylglucosamine, are very effective in copper(I)-catalysed 1,4-additions of ZnR2 to linear aliphatic enones (87â95% ee).
Copper-catalyzed enantioselective conjugate addition of Grignard reagents to acyclic enones using monodentate phosphoramidite ligands
作者:Beatriz Maciá、M. Ángeles Fernández-Ibáñez、Nataša Mršić、Adriaan J. Minnaard、Ben L. Feringa
DOI:10.1016/j.tetlet.2008.01.019
日期:2008.3
Herein, we report efficient catalysts based on phosphoramidites for the asymmetric copper-catalyzed conjugate addition of Grignard reagents to acyclic α,β-unsaturated ketones. A variety of Grignard reagents can be added to aliphatic and aromatic acyclicenones with good yields and moderate to good enantioselectivities.