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Relevant academic research and scientific papers

Implication of a Silyl Cobalt Dihydride Complex as a Useful Catalyst for the Hydrosilylation of Imines

Here, we describe the formation and use of silyl cobalt (III) dihydride complexes as powerful catalysts for the hydrosilylation of a variety of imines starting from a low-valent well-defined cobalt (I) complex. The reaction is efficient at low catalyst loadings with a diverse range of imines bearing various protecting groups, as well as aliphatic ketimines and quinoline. Kinetics, DFT calculations, NMR spectroscopic studies, deuteration experiments, and X-ray diffraction analyses allowed us to propose a catalytic cycle based on silyl dihydrocobalt (III) complexes performing a hydrocobaltation.

Hydrogen-Borrowing Amination of Secondary Alcohols Promoted by a (Cyclopentadienone)iron Complex

Thanks to a highly active catalyst, the scope of the (cyclopentadienone)iron complex-promoted 'hydrogen-borrowing' (HB) amination has been expanded to secondary alcohols, which had previously been reported to react only in the presence of large amounts of co-catalysts. A range of cyclic and acyclic secondary alcohols were reacted with aromatic and aliphatic amines giving fair to excellent yields of the substitution products. The catalyst was also able to promote the cyclization of diols bearing a secondary alcohol group with primary amines to generate saturated N-heterocycles.

A comparative reactivity survey of some prominent bisphosphine nickel(II) precatalysts in C-N cross-coupling

The synthesis and characterization of the new air-stable precatalyst (L1)Ni(o-tol)Cl (C1; where L1 = JosiPhos CyPF-Cy) is reported, along with the results of a comparative reactivity survey involving C1 and analogous PAd-DalPhos- and DPPF-containing precatalysts (C2 and C3, respectively) in representative nickel-catalyzed C(sp2)-N cross-coupling reactions. Precatalyst C1 was found to be competitive with, and in some cases complementary to, C2 in the monoarylation of ammonia and primary alkylamines with (hetero)aryl chlorides, including in otherwise challenging room temperature transformations. (Pseudo)halide comparison studies involving the cross-coupling of furfurylamine at room temperature revealed that in contrast to C2 precatalyst C1 performs less effectively with aryl bromides. Whereas C3 was found to be ineffective for such transformations, this DPPF-derived precatalyst proved superior to C1 and C2 in reactions involving the secondary dialkylamine test substrate morpholine.

A process for preparing amine compound using carbon-supported cobalt-rhodium nanoparticel catalyzed hydrogen-free recuctive amination

The present invention relates to hydrogen-free reductive amination of an aldehyde and/or ketone and an amine and/or nitroarene using cobalt-rhodium heterometal nanoparticles supported on carbon as a non-homogeneous catalyst. According to the present invention, it is possible to carry out amination under significantly lower pressure as compared to the reductive amination carried out in the presence of a conventional rhodium or ruthenium catalyst. In addition, there is no need for using an additional ligand, acid or base. Further, it is possible to use water generated in a reaction system by a water-gas shift reaction as a hydrogen source with no use of an external hydrogen source, and thus to use a solvent without purification. Thus, it is possible to simplify the reaction procedure. The catalyst system according to the present invention provides a simple method for preparing secondary and tertiary amines from various aldehydes and amines.

Chemoselective reductive amination of carbonyl compounds for the synthesis of tertiary amines using SnCl2·2H2O/PMHS/MeOH

Stannous chloride catalyzed chemoselective reductive amination of a variety of carbonyl compounds with aromatic amines has been developed for the synthesis of a diverse range of tertiary amines using inexpensive polymethylhydrosiloxane as reducing agent in methanol. The present method is also applicable for the synthesis of secondary amines including heterocyclic ones.

Hydrogen-Free Cobalt-Rhodium Heterobimetallic Nanoparticle-Catalyzed Reductive Amination of Aldehydes and Ketones with Amines and Nitroarenes in the Presence of Carbon Monoxide and Water

Cobalt-rhodium heterobimetallic nanoparticle-catalyzed reductive amination of aldehydes and ketones with amines in the presence of 5 atm carbon monoxide without an external hydrogen source has been developed. Water added and generated in situ produces hydrogen via a water-gas-shift reaction. The reaction can be extended to the tandem reduction of aldehydes and ketones with nitroarenes. The catalytic system is stable under the reaction conditions and could be reused eight times without losing any catalytic activity. (Chemical Equation Presented).

PROCESS FOR PREPARING AMINES

The present invention refers to a process for preparing amines comprising reacting a compound of the formula R1-CO-R2 comprising a carbonyl moiety with a amine compound of the formula HNR3R4 and carbon monoxide in the presence of a catalyst.

Process for preparing amines

The present invention refers to a process for preparing amines comprising reacting a compound of the formula R1-CQ-R2 comprising a carbonyl moiety with a amine compound of the formula HNR3R4 and carbon monoxide in the presence of a catalyst.

Reductive amination without an external hydrogen source

A method of reductive amination without an external hydrogen source is reported. Carbon monoxide is used as the reductant. The reaction proceeds efficiently for a variety of carbonyl compounds and amines at low catalyst loadings and is mechanistically interesting as it does not seem to involve molecular hydrogen. Look, no H2! Reductive amination without an external hydrogen source has been developed using carbon monoxide as the reductant and rhodium acetate (0.2-1mol %) as catalyst. The method tolerates a variety of functional groups and provides target amines in good to excellent yields.

Enantioselective organocatalytic reductive amination of aliphatic ketones by benzothiazoline as hydrogen donor

The chiral phosphoric acid-catalyzed enantioselective reductive amination of aliphatic ketones with aromatic amines was successfully achieved by the use of benzothiazoline as the hydrogen donor. Corresponding chiral aliphatic amines were obtained with exc