Enantioselective Henry reaction catalyzed by a copper(II) glucoBOX complex
作者:B.V. Subba Reddy、Jimil George
DOI:10.1016/j.tetasy.2011.06.012
日期:2011.6
A highlyenantioselectiveHenryreaction has been developed using a chiral copper(II)–glucoBOX complex. The catalytic system works well with a wide range of aromatic, aliphatic and heteroaromatic aldehydes to afford the corresponding nitroalkanols with high enantioselectivity (up to 99%) in excellent yields (up to 95%). The catalyst shows good enantioselectivity with 10 mol % of loading at easily attainable
Synthesis of Chiral 1,3-Diamines Derived from cis-2-Benzamidocyclohexanecarboxylic Acid and Their Application in the Cu-Catalyzed Enantioselective Henry Reaction
作者:Koichi Kodama、Kazuyuki Sugawara、Takuji Hirose
DOI:10.1002/chem.201102136
日期:2011.11.25
decrease in product enantioselectivity caused by spontaneous retro‐Henryreaction, which was suppressed by conducting the reaction at 0 °C. This versatile reaction afforded various β‐nitroalcohols in excellent yields and enantioselectivities (up to 98 % yield, 91 % enantiomeric excess) under the optimized reaction conditions. The chiral induction mechanism was explained on the basis of a previously
Chiral oxazoline ligands containing a 1,2,4-triazine ring and their application in the Cu-catalyzed asymmetric Henry reaction
作者:Ewa Wolińska
DOI:10.1016/j.tet.2013.06.084
日期:2013.9
Eleven members of newligand class incorporating a chiral oxazoline and a 1,2,4-triazine ring have been synthesized via Pd-catalyzed amination reaction of 3-halo-1,2,4-triazines with 2-(o-aminophenyl)oxazolines. Buchwald–Hartwig amination of 3-halo-1,2,4-triazines was investigated to establish the best conditions for synthesis of the title ligands. Catalytic activity of the newligands was evaluated in
Effect of Ligand Structure on the Zinc-Catalyzed Henry Reaction. Asymmetric Syntheses of (−)-Denopamine and (−)-Arbutamine
作者:Barry M. Trost、Vince S. C. Yeh、Hisanako Ito、Nadine Bremeyer
DOI:10.1021/ol020077n
日期:2002.8.1
[reaction: see text] Syntheses of variously modified ligands for the dinuclear zinc catalysts for the asymmetric aldol and nitroaldol (Henry) reactions are reported. Catalytic enantioselective nitroaldol reactions promoted by these modified ligands led to efficient syntheses of the beta-receptor agonists (-)-denopamine and (-)-arbutamine.
Chiral Cr(III)-salen complex embedded over sulfonic acid functionalized mesoporous SBA-15 material as an efficient catalyst for the asymmetric Henry reaction
作者:Md. Mominul Islam、Piyali Bhanja、Mita Halder、Anjan Das、Asim Bhaumik、Sk. Manirul Islam
DOI:10.1016/j.mcat.2019.110489
日期:2019.10
Designing novel catalytic system for efficient synthesis of enantiomerically pure β-hydroxy nitroalkanes is a challenging area of research. Herein, we have designed a chiral heterogeneous catalyst through the successful loading of chiral Cr(III)-salen complex over sulfonic acid functionalized SBA-15 material. The catalyst has been thoroughly characterized by powder XRD, N2 adsorption/desorption, XPS