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Relevant academic research and scientific papers

(S)-Pyrrolidine-containing chiral manganese(III)-salalen and -salan complexes as catalysts for the asymmetric henry reaction

Chiral Mn(III)-salalen and -salan complexes derived from (S)-proline have been used as catalysts for the asymmetric Henry (nitro-aldol) reaction. We have also used this methodology for a variety of substrates to afford nitroaldol products in 40-94% yields

Rhodium(I) complexes containing 9,10-phenanthrenequinone-N-substituted thiosemicarbazone ligands: Synthesis, structure, DFT study and catalytic diastereoselective nitroaldol reaction studies

Abstract New rhodium(I) complexes [Rh(CO)(L)] (1-3) were prepared by the reaction of [RhCl(CO)(PPh3)2] with 9,10-phenanthrenequinone-N-substituted thiosemicarbazones (HL1-3) and characterized by elemental and spectral anal

Synthesis of chiral salan ligands with bulky substituents and their application in Cu-catalyzed asymmetric Henry reaction

Several new chiral N,N’-dimethylated salan ligands with bulky substituents were synthesized and their in-situ generated Cu(II) complexes were evaluated in the asymmetric Henry reaction. Substituents on the aryloxide moieties of these ligands were found to

A new type of L-Tertiary leucine-derived ligand: Synthesis and application in Cu(II)-catalyzed asymmetric Henry reactions

A new series of Schiff bases derived from amino acids were developed as chiral ligands for Cu(II)-catalyzed asymmetric Henry reactions. The optimum ligand 7d exhibited outstanding catalytic efficiency in the Cu(II)-catalyzed asymmetric Henry additions of four nitroalkanes to different kinds of aldehydes to produce 76 desired adducts in high yields (up to 96%) with excellent enantioselectivities, up to 99% enantiomeric excess (ee).

D-Mannitol-derived novel chiral thioureas: Synthesis and application in asymmetric Henry reactions

Five novel thioureas have been obtained through multi-step reactions from D-Mannitol as starting material and applied as catalysts in the asymmetric Henry reaction. Using catalyst 7a, (1S,2R)-2-nitro-1-phenylpropan-1-ol containing two chiral centers was o

Asymmetric Henry reaction catalyzed by chiral Cu(II) salalen and salan complexes derived from (S)-proline

Single chiral center C1 symmetric salalen and salan ligands were synthesized from (S)-proline and their Cu(II) complexes were used as catalysts for the asymmetric Henry reaction between aromatic aldehydes and nitromethane/nitroethane. The react

Synthesis of chiral salalen ligands and their in-situ generated Cu-complexes for asymmetric Henry reaction

Chiral salalen ligands derived from (S)-proline and derivatives of salicyaldehydes were synthesized, and their in-situ generated Cu (II) complexes were evaluated in the asymmetric Henry reaction. Salalen ligand of different substituents on the phenyl moiety showed remarkable effect on the enantioselectivity of nitro-aldol product of 4-nitrobenzaldehyde and nitromethane. Cu (II) complex generated in situ with (S)-2-(tert-butyl)-6-((2-(((2-hydroxy-3-methylbenzylidene)amino)methyl)pyrrolidin-1-yl)methyl) phenol (10?mol%) and Cu (OAc)2.H2O (10?mol%), found to be better catalyst for nitro-aldol reaction between 4-nitrobenzaldehyde and nitromethane, gave corresponding product in 85% yield and 88% enantiomeric excess (ee) in isopropanol at 35°C after 40?hours. The catalyst also used for the Henry reaction with different substituted benzaldehydes and corresponding products were obtained in 22% to 99% yields with 66% to 92% ee. Henry reaction of 4-nitrobenzaldehyde and prochiral nitroethane gave anti-selective product (dr?=?79/21; anti/syn) in a 91% yield with 80% ee.

Anti-Selective Asymmetric Henry Reaction Catalyzed by a Heterobimetallic Cu-Sm-Aminophenol Sulfonamide Complex

A novel heterobimetallic Cu/Sm/aminophenol sulfonamide complex has been developed by a convenient one-pot method for the anti-selective asymmetric Henry reaction. The corresponding anti-β-nitro alcohols are obtained in up to 99% yield, >30:1 dr, and 98% ee. The results of control experiments and ESI-MS analysis of the complex indicate that the monomeric bimetallic Cu/Sm/1 complex would be the active species.

The synthesis, structure, topology and catalytic application of a novel cubane-based copper(ii) metal-organic framework derived from a flexible amido tripodal acid

A novel chiral metal-organic framework, [Cu4(HL)2(H2O)4(MeO)4]n (1), has been successfully synthesized from a tripodal flexible ligand (2S,2′S,2"S)-2,2′,2"-(benzenetricarbonyltris(azanediyl

Design of a chiral secondary amine ligand for copper-catalyzed anti -selective Henry reaction

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 secondary amine portion, promoted