Proximity effects in diaryl derivatives. Part 7. Mechanism of base-catalysed rearrangement of 2-(hydroxyamino)aryl phenyl sulphones to 2-hydroxy-2′-(phenylsulphonyl)azoxybenzenes
作者:Robert J. Cummings、Michael F. Grundon、Anthony C. Knipe、Adil S. Wasfi
DOI:10.1039/p29830000105
日期:——
Base-catalysedrearrangement of a 2-(hydroxyamino)arylphenylsulphone (1b) to the 2-hydroxy-2′-(phenylsulphonyl)azoxybenzene (4b) was shown by isolation and kinetic studies to be a rapid reaction requiring oxygen; in the absence of oxygen the sulphur-free azoxybenzene (3; R = Cl) was the only product isolated from the reaction of (1c). A mechanism for the formation of 2-hydroxyazoxybenzenes (4) is
分离和动力学研究表明,碱催化的2-(羟基氨基)芳基苯基砜(1b)重排至2-羟基-2'-(苯基磺酰基)氮杂苯(4b)是需要氧气的快速反应。在没有氧气的情况下,无硫的z氧基苯(3; R = Cl)是唯一从(1c)反应中分离的产物。提出了形成2-羟基乙氧基苯(4)的机理(方案2),涉及亚硝基芳基自由基阴离子(9)二聚为NN的二价阴离子。-二醇(10),以及通过氧从氮原子的分子内转移来取代苯磺酰基。对2-(羟氨基)芳基苯硫醚(12)在氧气存在下的碱催化反应的类似研究表明,离去基团较弱时,会形成双(苯硫基)氮氧基苯(11; R = SPh)。描述了一种由硝基苯制备N-芳基羟胺的改进方法。
Kano, Kunio; Koga, Masahiro; Anselme, Jean-Pierre, Bulletin des Societes Chimiques Belges, 1987, vol. 96, # 2, p. 137 - 144
TiO2-modified MALDI target for in vitro modeling of the oxidative biotransformation of diclofenac
作者:Alexander Yu. Gorbunov、Konstantin A. Krasnov、Alexander A. Bardin、Olga A. Keltsieva、Vladimir N. Babakov、Ekaterina P. Podolskaya
DOI:10.1016/j.mencom.2020.03.030
日期:2020.3
The UV-induced photocatalytic oxidation in the presence of TiO2 nanoparticles (UV/TiO2-PCO) is a more adequate approach than electrochemical oxidation to simulate the oxidative metabolism of diclofenac based on the comparative analysis of oxidation products using high-resolution tandem mass spectrometry. A simple and fast high-throughput technique is proposed for modeling the oxidative metabolism, which involves UV/TiO2-PCO performed directly on a MALDI target and subsequent analysis by matrix-assisted laser desorption/ionization mass spectrometry. The ranges and yields of diclofenac oxidation products obtained by the conventional bulk UV/TiO2-PCO and the proposed on-target version are in excellent agreement.
Epoxy-epimination of cyclic conjugated dienes-VII-
作者:Daniel Rousselle、Eric Francotte、Jeannine Feneau-Dupont、Bernard Tinant、Jean P. Declercq、Heinz G. Viehe
DOI:10.1016/s0040-4020(01)96173-3
日期:1991.9
[4+2] Cycloaddition of halogenated nitroso benzenes to cyclopentadiene followed by isomerisation of the intermediate adduct occurs already at room temperature to furnish the epoxy-epimine 1 and the epiminopentadienal 2. The structure proof of 1 is based on X-ray analysis.
CUMMINGS, R. J.;GRUNDON, M. F.;KNIPE, A. C.;WASFI, A. S., J. CHEM. SOC. PERKIN TRANS., 1983, N 2, 105-108
作者:CUMMINGS, R. J.、GRUNDON, M. F.、KNIPE, A. C.、WASFI, A. S.