Abstract The catalyticoxidative domino degradation of phenols was investigated. Hydrogenperoxide (30% aq.) was used as an oxidant and 2,2′-dinitro-4,4′-ditrifluoromethyldiphenyl diselenide 4e as a catalyst. The products were muconic acid 5, and muconolactones muconolactones—5-carboxymethylfuran-2(5H)-ones 7 and 9. Phenols with alkyl groups at 2 or 4 positions of the benzene ring were converted regioselectively
Conversion of bis(o-nitrophenyl)diselenides to heterocycles containing selenium and nitrogen with the aid of samarium diiodide
作者:Xiaoyuan Chen、Weihui Zhong、Yongmin Zhang
DOI:10.1002/hc.10034
日期:——
Treatment of bis(o-nitrophenyl)diselenides with SmI2 led to simultaneous reduction of nitro groups and reductive cleavage of SeSe bonds as well as to the formation of the intermediates 2. The intermediates 2 were “living” double-anions formed in situ, and reacted readily with ω-bromoketones and α-bromocarboxylic acid derivatives to afford the desired 2H-1,4-benzoselenazines and 2H-1,4-benzoselenazin-3(4H)-ones
A One-Pot Access to Benzo[b][1,4]selenazines from 2-Aminoaryl Diselenides
作者:Stefano Menichetti、Antonella Capperucci、Damiano Tanini、Antonio L. Braga、Giancarlo V. Botteselle、Caterina Viglianisi
DOI:10.1002/ejoc.201600351
日期:2016.6
Different 2-sulfonylaminoaryl diselenides substituted with electron-withdrawing or -donating groups are transformed in one pot into benzo[b][1,4]selenazines. The reaction uses a substoichiometric amount of Cu(OTf)2, and the mechanism involves a base-mediated 1,4-elimination at selenium with the generation of an o-iminoselenoquinone and a 2-sulfonylaminoselenolate anion. The former is a dienic species
A NOVEL SYNTHESIS OF 2<i>H</i>-1,4-BENZOSELENAZINES FROM (<i>o</i>-NITROPHENYL)DISELENIDES AND<i>ω</i>-BROMOKETONES PROMOTED BY Sm/TiCl<sub>4</sub>SYSTEM
作者:Weihui Zhong、Yongmin Zhang、Xiaoyuan Chen
DOI:10.1080/00304940109356585
日期:2001.4
Sm/TiCI, system could induce simultaneous reduction of nitro group and S-S bond in bis(o-nitropheny1)disulfides to give heterocycles containing nitrogen and sulfur." Compared with S-S bond, Se-Sebond is easier to reduce by the Sm/TiCI, system.i In order to extend the application of Sm/TiCl,, we investigated if the Sm/TiCI, system could induce simultaneous reduction of nitro group and Se-Sebond in bi
Synthesis of 2 H -1,4-benzothiazin-3(4 H )-ones and 2 H -1,4-benzoselenazin-3(4 H )-ones with the aid of samarium(II) iodide
作者:Weihui Zhong、Yongmin Zhang
DOI:10.1016/s0040-4039(01)00360-4
日期:2001.4
Bis(o-nitrophenyl) disulfides or diselenides were easy to reduce by samarium(II) iodide to produce the active intermediates 2 in situ, which readily react with alpha -halocarboxylic derivatives to yield the corresponding products 2H-1,4-benzothiazin-3(4H)-ones and 2H-1,4-benzoselenazin-3(4H)-ones, respectively, in moderate to high yields under mild conditions. (C) 2001 Elsevier Science Ltd. All rights reserved.