The successful mononitration of a variety of electron-rich aromatic substrates is reported, employing either nitronium tetrafluoroborate or "claycop" as the nitrating agent. Dinitration of four of the substrates was achieved when employing nitronium tetrafluoroborate. Several of the products have previously been prepared only by indirect methods. (C) 1998 Elsevier Science Ltd. All rights reserved.
Iodine(III)-Catalyzed Electrophilic Nitration of Phenols via Non-Brønsted Acidic NO<sub>2</sub><sup>+</sup> Generation
作者:Kevin A. Juárez-Ornelas、J. Oscar C. Jiménez-Halla、Terumasa Kato、César R. Solorio-Alvarado、Keiji Maruoka
DOI:10.1021/acs.orglett.8b04141
日期:2019.3.1
The first catalytic procedure for the electrophilic nitration of phenols was developed using iodosylbenzene as an organocatalyst based on iodine(III) and aluminum nitrate as a nitro group source. This atom-economic protocol occurs under mild, non-Brønsted acidic and open-flask reaction conditions with a broad functional-group tolerance including several heterocycles. Density functional theory (DFT)
使用碘基苯作为基于碘(III)和硝酸铝作为硝基基团来源的有机催化剂,开发了用于苯酚亲电硝化的第一个催化程序。该原子经济方案发生在温和的,非布朗斯台德酸性和开放式烧瓶反应条件下,具有宽泛的官能团耐受性,包括多个杂环。(SMD:MeCN)Mo8-HX /(LANLo8 + f,6-311 + G *)水平的密度泛函理论(DFT)计算表明反应通过阳离子途径进行,该途径有效地产生了NO 2 +离子,从而是中性条件下的硝化物种。
o-Nitrophenyltriflates in Quinoline Synthesis: Easy Access to a Streptonigrin Synthon