Regioselective N-arylation of nitroazoles. Determination of the structure of N-arylnitro-azoles on the basis of NMR spectroscopic data and quantum-chemical calculations
摘要:
The N-arylation of a series of nitroazoles has been studied with the aid of diaryliodonium salts in the presence of CuI under the action of microwave radiation. It was found that alkylation proceeds regioselectively in each actual case with the formation of one of two possible isomers. The correct structure of the N-arylation products was established on the basis of NMR spectroscopy.
been shown that reactions of 4-nitroimidazoles and some other nitroaromatic systems with phenyl-acetonitrile in the presence of sodium methoxide in methanol lead to the reduction of the nitro to nitroso group and to the nucleophilic displacement of hydrogen atom at the ring by the respective carbanion followed by tautomerization of the nitroso compound to an oxime. Similar reactions of 4-nitroimidazoles
Reduction of aromatic nitrocompounds by sodium borohydride in methanol in the presence of sodium methoxide
作者:Jerzy Suwiński、Pawel Wagner、Elizabeth M. Holt
DOI:10.1016/0040-4020(96)00491-7
日期:1996.7
The paper presents the results of the reduction of 4-nitroimidazoles, 4-nitropyrazoles and 3-nitropyridines by sodiumborohydride or sodium borodeuteride in methanol in the presence of sodium methoxide, 1-Substituted 4-nitroimidazoles yield oximes of 4-imidazolidinones, the nitropyrazoles and nitropyridines yield respective azoxy compounds. The reaction mechanism proposed in the work makes allowances
Synthesis and photochemical properties of 1-aryl-4-nitroimidazoles are described. These compounds are good sensitizers of superoxide ion. Only 1-phenyl-2-methyl-4-nitroimidazole is a photosensitizer of singlet oxygen.
Practical copper-catalyzed N-arylation of amines with 20% aqueous solution of n-Bu4NOH
作者:Hamidreza Molaei、Mohammad Mehdi Ghanbari
DOI:10.1016/j.cclet.2011.12.015
日期:2012.3
N-Arylation of a wide variety of amines with phenylboronic acid catalyzed by copper acetate under 20% aqueous solution of n-Bu4NOH was accomplished in good to excellent yields (up to 92%) and substrate conversions (up to 96%). (C) 2011 Mohammad Mehdi Ghanbari. Published by Elsevier B.V. on behalf of Chinese Chemical Society. All rights reserved.
Suwinski, J.; Walczak, K., Polish Journal of Chemistry, 1994, vol. 68, # 4, p. 675 - 682