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
Asymmetric Henry reactions of aldehydes with various nitroalkanes catalyzed by copper(II) complexes of novel chiral<i>N</i>-monoalkyl cyclohexane-1,2-diamines
作者:Fei Liu、Shaohua Gou、Lei Li
DOI:10.1002/aoc.3107
日期:2014.3
2‐diamine (3g), the reaction was optimized in terms of the metal ion, temperature, solvent and base. Further experiments indicated that the complex, 3g–Cu(OAc)2, was an efficient catalyst in the asymmetricHenryreaction between different aldehydes and nitromethane, and the desired products have been obtained with high chemical yields (up to 99%) and high enantiomeric excess (up to 93%). The optimized catalyst
Asymmetric Henry reaction catalysed by L-proline derivatives in the presence of Cu(OAc)<sub>2</sub>: isolation and characterization of an<i>in situ</i>formed Cu(II) complex
作者:H. Atoholi Sema、Ghanashyam Bez、Sanjib Karmakar
DOI:10.1002/aoc.3123
日期:2014.4
by the Henry reaction is one of the most exploited carbon–carbon bond‐formingreactions owing to the versatility of both functional groups for synthetic manipulation by functional group interconversion. Here we report synthesis of a series of proline‐derived compounds to study their catalytic activities for asymmetric Henry reaction in the presence of Cu(OAc)2.H2O. The proline derivative, 2‐((E)‐(((
Highly regioselective synthesis of chiral diamines via a Buchwald-Hartwig amination from camphoric acid and their application in the Henry reaction
作者:Magdalena Uzarewicz-Baig、Maximilian Koppenwallner、Sobia Tabassum、René Wilhelm
DOI:10.1002/aoc.3162
日期:2014.7
In this work the synthesis of new asymmetric diamine ligands from camphoric acid is described. The new diamines can be directly prepared in a regioselective arylation of the less hindered primary amine group of (+)‐cis‐1,2,2‐trimethylcyclopentane‐1,3‐diamine via a Buchwald–Hartwig amination in high yields. The resulting diamines incorporate a secondary and primary amine group and were successfully
Design of a Chiral Secondary Amine Ligand for Copper-Catalyzed anti-Selective Henry Reaction
作者:Takayoshi Arai、Akinori Joko、Katsuya Sato
DOI:10.1055/s-0034-1379607
日期:——
A series of chiral binaphthyl-containing diphenylethylenediamine (binaph-dpen) ligands was designed and synthesized for the copper-catalyzed asymmetric Henry reaction. The N-monobenzyl (S)-binaph-(R,R)-dpen ligand, with a secondaryamine portion, promoted the Cu(OAc)2-catalyzed Henry reaction with excellent enantioselectivity in an anti-selective manner.