Iron(III)-Promoted Oxidative Coupling of Naphthylamines: Synthetic and Mechanistic Investigations
摘要:
A facile route to the synthesis of 1,1'-binaphthyl-4,4'-diamines (naphthidines) and 1,1'-binaphthyl-2,2'-diamines (BINAMs) was developed by the oxidative homocoupling of 1- and 2-naphthylamines, respectively, using FeCl(3) as oxidant and K(2)CO(3) as base in 1,2-dichloroethane under ambient conditions. A preliminary mechanistic investigation was performed by the ESR spectroscopy and intermediate-trapping technique.
We herein describe a practical direct amination of phenols through a palladium-catalyzed hydrogen-transfer-mediated activation method to synthesize the secondary and tertiary amines. In this conversion, environmentally friendly water and inexpensive ammonium formate were used as solvent and reductant, respectively. A range of amines, including aliphatic amines, aniline, secondary amines, and diamines
Enabling Reductive C–N Cross-Coupling of Nitroalkanes and Boronic Acids by Steric Design of P(III)/P(V)═O Catalysts
作者:Gen Li、Yuzuru Kanda、Seung Youn Hong、Alexander T. Radosevich
DOI:10.1021/jacs.2c01487
日期:2022.5.11
bond-forming reductive coupling of nitroalkanes with arylboronicacids and esters is reported. The method shows excellent chemoselectivity for the nitro/boronicacid substrate pair, allowing the synthesis of N-(hetero)arylamines rich in functionalization. The identification of a sterically reduced phosphetane catalyst capable of productive coupling in the P(III)/P(V)═O redox manifold is the key enabling development
Synthesis, photophysical characterisation and photostability studies of NIR probes with aliphatic, aromatic and chlorinated terminals in 5- and 9-amino positions of benzo[ a ]phenoxazines
m chlorides possessing mono and disubstituted amines with 3-chloropropyl groups at the 9-position, isopropyl, cyclohexyl and phenyl groups as terminals at 5-postion was synthesised. Photophysical studies were performed in dry ethanol and aqueous solutions. The terminals at the 5-amino position were found to influence the acid-base equilibrium. The presence of hydroxyl functionality at 2-position was
importance of polyfunctional amines, C–N bond formation is important in synthetic organic chemistry. Here we present a neutral amination reaction using azides as the nitrogen source and arylboronic acids with a rhodium(I) catalyst to afford alkyl–aryl and aryl–aryl secondary amines. Natural products and pharmaceutical derivatives were applied, and gram-scale reactions were performed, which demonstrated the
Pyrolysis/GC/MS Analysis of <i>N</i>-(1-Deoxy-<scp>d</scp>-fructos-1-yl)-<scp>l</scp>-phenylalanine: Identification of Novel Pyridine and Naphthalene Derivatives
作者:Anahita Keyhani、Varoujan A. Yaylayan
DOI:10.1021/jf950418u
日期:1996.1.1
Pyrolysis/GC/MS has been employed to analyze phenylalanine specific products formed during Maillard reaction. Phenylalanine Amadori product and different model systems containing phenylalanine and glucose, ribose, or glycerladehyde were studied. Ribbon pyrolysis was used to study the effect of temperature (150, 200, 250 degrees C) on the efficiency of formation of initial pyrolysis products from phenylalanine and Amadori phenylalanine. Quartz tube pyrolysis was used at 250 degrees C to enhance the secondary reactions. To address specific mechanistic questions, [1-C-13]glucose was used. These studies revealed the formation of pyridine and naphthalene derivatives such as 3,5-diphenylpyridine, 1(2)-naphthaleneamine, N-methyl-1(2)-aminonaphthalene, 1-aminoanthracene, 2'-phenylpyrrolo [4,5-a] dihydronaphthalene, 1(2)-(N-phenethyl)naphthaleneamine, and 1(2)-(N-phenethyl-N-methyl)naphthaleneamine. The precursors for pyridine and naphthalene derivatives were verified by GC/MS identification of the target compounds in the reaction mixtures of the postulated precursors.