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
Catalytic anti-selective asymmetric Henry (nitroaldol) reaction catalyzed by Cu(I)–amine–imine complexes
作者:Yao Qiong Ji、Gao Qi、Zaher M.A. Judeh
DOI:10.1016/j.tetasy.2011.12.010
日期:2011.12
derived from N-methyl-C1-tetrahydro-1,1′-bisisoquinolines (R)-1b and Cu(I)Cl promoted the diastereoselective Henry reaction of nitroethane with a series of aromatic and aliphatic aldehydes. The nitroalcohol adducts were obtained in excellent yields (up to 95%), moderate anti-selectivity (up to 2.6:1), and good enantioselectivity (up to 92% ee) without any special precautions to exclude moisture or air