15185-02-1Relevant articles and documents
Preparation of deuteriated benzylamines and phenethylamine with Raney alloys in an alkaline deuterium oxide solution
Tsukinoki,Tsuzuki,Ishimoto,Nakayama,Kakinami,Mataka,Tashiro
, p. 839 - 844 (1994)
Benzyl-α,α-2H2-amine, 2-2H1-Benzyl-α,α-2H2-amine, 3-2H1-Benzyl-α,α-2H2-amine, 4-2H1-Benzyl-α,α-2H2-am
Highly Selective Ruthenium-Catalyzed Direct Oxygenation of Amines to Amides
Ray, Ritwika,Hazari, Arijit Singha,Chandra, Shubhadeep,Maiti, Debabrata,Lahiri, Goutam Kumar
supporting information, p. 1067 - 1071 (2018/01/03)
Reports on aerobic oxidation of amines to amides are rare, and those reported suffer from several limitations like poor yield or selectivity and make use of pure oxygen under elevated pressure. Herein, we report a practical and an efficient ruthenium-catalyzed synthetic protocol that enables selective oxidation of a broad range of primary aliphatic, heterocyclic and benzylic amines to their corresponding amides, using readily available reagents and ambient air as the sole oxidant. Secondary amines instead, yield benzamides selectively as the sole product. Mechanistic investigations reveal intermediacy of nitriles, which undergo hydration to afford amide as the final product.
Rhodium-Catalyzed Intramolecular C-H Bond Activation with Triazoles: Preparation of Stereodefined Pyrrolidines and Other Related Cyclic Compounds
Senoo, Masato,Furukawa, Ayana,Hata, Takeshi,Urabe, Hirokazu
, p. 890 - 895 (2016/01/16)
On treatment of triazoles having an N-sulfonyl-protected benzylamine moiety with [Rh2(C7H15CO2)4], intramolecular C-H bond insertion takes place at the benzylic position to give cis-N-sulfonyl-2-aryl-3-[(sulfonylimino)methyl]pyrrolidines in good yields and with highly stereoselectivities. Analogously, the similar treatment of triazoles having an ether or even an alkyl moiety affords 2-alkyl- or 2-aryl-3-[(sulfonylimino)methyl]tetrahydrofurans or a 2-alkyl-3-[(sulfonylimino)methyl]cyclopentane in good yields. Three is a magic number: On treatment of triazoles with [Rh2(C7H15CO2)4], the rhodium catalyst plays three roles, denitrogenation, C-H bond activation, and stereoselective cyclization, providing a new method for heterocycle synthesis. Intramolecular C-H bond insertion takes place at the benzylic position to give pyrrolidines and related heterocycles in good yields.
Amine oxidative N-dealkylation via cupric hydroperoxide Cu-OOH homolytic cleavage followed by site-specific fenton chemistry
Kim, Sunghee,Ginsbach, Jake W.,Lee, Jung Yoon,Peterson, Ryan L.,Liu, Jeffrey J.,Siegler, Maxime A.,Sarjeant, Amy A.,Solomon, Edward I.,Karlin, Kenneth D.
, p. 2867 - 2874 (2015/03/14)
Copper(II) hydroperoxide species are significant intermediates in processes such as fuel cells and (bio)chemical oxidations, all involving stepwise reduction of molecular oxygen. We previously reported a CuII-OOH species that performs oxidative N-dealkylation on a dibenzylamino group that is appended to the 6-position of a pyridyl donor of a tripodal tetradentate ligand. To obtain insights into the mechanism of this process, reaction kinetics and products were determined employing ligand substrates with various para-substituent dibenzyl pairs (-H,-H; -H,-Cl; -H,-OMe, and -Cl,-OMe), or with partially or fully deuterated dibenzyl N-(CH2Ph)2 moieties. A series of ligand-copper(II) bis-perchlorate complexes were synthesized, characterized, and the X-ray structures of the -H,-OMe analogue were determined. The corresponding metastable CuII-OOH species were generated by addition of H2O2/base in acetone at -90 °C. These convert (t1/2 ≈ 53 s) to oxidatively N-dealkylated products, producing para-substituted benzaldehydes. Based on the experimental observations and supporting DFT calculations, a reaction mechanism involving dibenzylamine H-atom abstraction or electron-transfer oxidation by the CuII-OOH entity could be ruled out. It is concluded that the chemistry proceeds by rate limiting Cu-O homolytic cleavage of the CuII-(OOH) species, followed by site-specific copper Fenton chemistry. As a process of broad interest in copper as well as iron oxidative (bio)chemistries, a detailed computational analysis was performed, indicating that a CuIOOH species undergoes O-O homolytic cleavage to yield a hydroxyl radical and CuIIOH rather than heterolytic cleavage to yield water and a CuII-O?- species.
Catalytic Amine Oxidation under Ambient Aerobic Conditions: Mimicry of Monoamine Oxidase B
Murray, Alexander T.,Dowley, Myles J. H.,Pradaux-Caggiano, Fabienne,Baldansuren, Amgalanbaatar,Fielding, Alistair J.,Tuna, Floriana,Hendon, Christopher H.,Walsh, Aron,Lloyd-Jones, Guy C.,John, Matthew P.,Carbery, David R.
supporting information, p. 8997 - 9000 (2015/08/03)
The flavoenzyme monoamine oxidase (MAO) regulates mammalian behavioral patterns by modulating neurotransmitters such as adrenaline and serotonin. The mechanistic basis which underpins this enzyme is far from agreed upon. Reported herein is that the combination of a synthetic flavin and alloxan generates a catalyst system which facilitates biomimetic amine oxidation. Mechanistic and electron paramagnetic (EPR) spectroscopic data supports the conclusion that the reaction proceeds through a radical manifold. This data provides the first example of a biorelevant synthetic model for monoamine oxidase B activity.
Predictably selective (sp3)C-O bond formation through copper catalyzed dehydrogenative coupling: Facile synthesis of dihydro-oxazinone derivatives
Modak, Atanu,Dutta, Uttam,Kancherla, Rajesh,Maity, Soham,Bhadra, Mohitosh,Mobin, Shaikh M.,Maiti, Debabrata
supporting information, p. 2602 - 2605 (2014/06/09)
An intramolecular dehydrogenative (sp3)C-O bond formation in salicylamides can be initiated by an active Cu/O2 species to generate pharamaceutically relevant dihydro-oxazinones. Experimental findings suggest that stereoelectronic parameters in both coupling partners are controlling factors for site selectivity in bond formation. Mechanistic investigations including isotope labeling, kinetic studies helped to propose a catalytic cycle. The method provides a convenient synthesis of an investigational new medicine CX-614, which has potential in finding treatment for Parkinson's and Alzheimer's diseases.
Selective formation of imines by aerobic photocatalytic oxidation of amines on TiO2
Lang, Xianjun,Ji, Hongwei,Chen, Chuncheng,Ma, Wanhong,Zhao, Jincai
supporting information; experimental part, p. 3934 - 3937 (2011/05/15)
An oxygenation pathway: The title transformation involves a two-step process: a selective oxygenation step to generate aldehyde intermediates and a subsequent condensation step to afford the imine products (see scheme).
Nitrogen kinetic isotope effects for the monoamine oxidase B-catalyzed oxidation of benzylamine and (1,1-2H2)benzylamine: Nitrogen rehybridization and CH bond cleavage are not concerted
MacMillar, Susanna,Edmondson, Dale E.,Matsson, Olle
supporting information; experimental part, p. 12319 - 12321 (2011/10/09)
Nitrogen kinetic isotope effects for the oxidation of benzylamine and (1,1-2H2)benzylamine by recombinant human monoamine oxidase B show that cleavage of the CH bond is not concerted with rehybridization of the nitrogen atom.
Complete replacement of H2 by D2 via Pd/C-catalyzed H/D exchange reaction
Sajiki, Hironao,Kurita, Takanori,Esaki, Hiroyoshi,Aoki, Fumiyo,Maegawa, Tomohiro,Hirota, Kosaku
, p. 3521 - 3523 (2007/10/03)
(Chemical Equation Presented) A general and in situ D2 gas generation method using 10% Pd/C-catalyzed H2-D2 exchange reaction in a H2-D2O system has been developed. H 2 gas sealed in a reac
Oxidative N-debenzylation of N-benzyl-N-substituted benzylamines catalyzed by horseradish peroxidase
Kim, Sung Soo,Jung, Hwan
, p. 555 - 558 (2007/10/03)
A report on the oxidative N-debenzylation of N-benyl-N-substituted benzylamines catalyzed by horseradish peroxidase was presented. A solution of benzylamine in benzene was added to a benzene solution of p-anisaldehyde in 100 ml flask over 10 minutes. Expulsion of proton and hydroxylation yielding α-hydroxylamines were followed by the formation of benzaldehydes and benzylamines.