catalytic asymmetric Henry reaction has been developed with use of a sulfonyldiamine−CuCl complex as a catalyst. A series of new binaphthyl-containing sulfonyldiamine ligands (2a−h) were readily synthesized in two steps starting from commercially available chiral 1,2-diamines. The (R,R)-diamine-(R)-binaphthyl ligand (2d)−CuCl complex smoothly catalyzed the enantioselective Henry reaction with the assistance
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
diastereoselective Henry reaction of various aldehydes with nitroethane was developed using the guanidine-thioureabifunctional catalyst 1 (syn selectivity of 86:14 to 99:1 with 84–99 % ee). A variety of nitroalkanes was treated with unbranched and branched aldehydes and gave nitro alcohols with high syn diastereoselectivities (90:10 to 99:1) and high enantioselectivities (85–95 % ee). This reaction was successfully
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.