Amberlyst-15–Catalyzed Synthesis of 2-Substituted 1,3-Benzazoles in Water under Ultrasound
摘要:
A clean and general method has been developed for the synthesis of benzothiazole, benzoxazole, and benzimidazoles using Amberlyst-15 as a recyclable catalyst under ultrasound irradiation in water. The methodology is operationally simple, free from the use of hazardous organic solvents, and does not require the use of inert or anhydrous atmosphere. A number of 1,3-benzazole derivatives were prepared in good to excellent yields by using this methodology. [Supplementary materials are available for this article. Go to the publisher's online edition of Synthetic Communications (R) for the following free supplemental resource: Full experimental and spectral details.]
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。
Regioselective Green Electrochemical Approach to the Synthesis of Nitroacetaminophen Derivatives
作者:Eslam Salahifar、Davood Nematollahi、Mehdi Bayat、Amir Mahyari、Hadi Amiri Rudbari
DOI:10.1021/acs.orglett.5b01837
日期:2015.10.2
A regioselective greensynthesis of nitroacetaminophen derivatives was carried out by electrochemical oxidation of acetaminophen, N-(2-hydroxyphenyl)acetamide, and 1-(4-(4-hydroxyphenyl)piperazin-1-yl)ethanone in the presence of nitrite ion as a nucleophile. The present work has led to the development of a reagentless green and facile electrochemical method for the synthesis of some nitroacetaminophen