New Highly Asymmetric Henry Reaction Catalyzed by CuII and aC1-Symmetric Aminopyridine Ligand, and Its Application to the Synthesis of Miconazole
作者:Gonzalo Blay、Luis R. Domingo、Victor Hernández-Olmos、José R. Pedro
DOI:10.1002/chem.200800069
日期:2008.5.19
A new catalytic asymmetricHenryreaction has been developed that uses a C(1)-symmetric chiral aminopyridineligand derived from camphor and picolylamine. A variety of aromatic, heteroaromatic, aliphatic, and unsaturated aldehydes react with nitromethane and other nitroalkanes in the presence of DIPEA (1.0 equiv), Cu(OAc)(2)*H(2)O (5 mol %), and an aminopyridineligand (5 mol %) to give the expected
Asymmetric Henry Reactions Catalyzed by Metal Complexes of Chiral Boron-Bridged Bisoxazoline (borabox) Ligands
作者:Aurélie Toussaint、Andreas Pfaltz
DOI:10.1002/ejoc.200800570
日期:2008.9
Metalcomplexes of boron-bridgedbisoxazolines (boraboxligands) were evaluated as catalysts for the Henryreaction. Copper(II) complexes induced high enantio- and diastereoselectivity in reactions with nitroethane and nitropropane. The amount of base added had a strong influence on the formation of the chiralcomplex and the enantioselectivity. Comparison with the corresponding dimethylmethylene-bridged
Environmentally Friendly Solvent-Free Processes: Novel Dual Catalyst System in Henry Reaction
作者:Apurba Bhattacharya、Vikram C. Purohit、Frank Rinaldi
DOI:10.1021/op020222c
日期:2003.5.1
Our environmentally benign synthesis of nitroalcohols involves a simple solvent-free condensation of an appropriate aldehyde with a 1-nitroalkane utilizing a novel dual catalytic system consisting of a mineral base and an appropriate surfactant under homogeneous conditions. By proper choice of the catalyst, base, and/or reaction conditions, the reaction can be performed to a level of >90% conversion as well as selectivity.