通过使用碘基苯作为无毒的碘(III)基氧化剂和碘化铵作为廉价的碘原子源,开发了一种用于亲电子碘化苯酚的氧化方法。通过用K 3 PO 4缓冲反应介质来实现完全受控的单碘化。在温和的温度下,在开放的烧瓶中,该方案以较短的反应时间进行,并且通常收率很高。用富电子和贫电子的酚以及杂环探索了革兰氏反应以及该方案的范围。量子化学计算显示,PhII(OH)·NH 3是最可能的碘化活性物质,呈反应性“ I +synthon。鉴于碘代芳烃部分的相关性,我们在本文中提出了实用,有效和简单的方法,其具有允许进入碘代芳烃核心单元的宽泛的官能团范围。
Synthesis of <i>o</i>-Carboxyarylacrylic Acids by Room Temperature Oxidative Cleavage of Hydroxynaphthalenes and Higher Aromatics with Oxone
作者:Keshaba Nanda Parida、Jarugu Narasimha Moorthy
DOI:10.1021/acs.joc.5b00292
日期:2015.8.21
A simple procedure for the synthesis of a variety of o-carboxyarylacrylic acids has been developed with Oxone (2KHSO5·KHSO4·K2SO4); the oxidation reaction involves the stirring of methoxy/hydroxy-substituted naphthalenes, phenanthrenes, anthracenes, etc. with Oxone in an acetonitrile–water mixture (1:1, v/v) at rt. Mechanistically, the reaction proceeds via initial oxidation of naphthalene to o-quinone
已经用Oxone(2KHSO 5 ·KHSO 4 ·K 2 SO 4)开发了一种简单的合成多种邻-羧基芳基丙烯酸的方法。氧化反应包括在室温下将乙氧基/羟基取代的萘,菲,蒽等与Oxone在乙腈-水混合物(1:1,v / v)中搅拌。从机理上讲,该反应是通过将萘初始氧化为邻醌而进行的,该邻苯醌会裂解成相应的邻羧基芳基丙烯酸。发现高级芳族化合物产生衍生自最初形成的邻-羧基芳基丙烯酸的羧甲基内酯。
Development and Mechanistic Studies of Iron-Catalyzed Construction of Csp<sup>2</sup>–B Bonds via C–O Bond Activation
Herein we describe an iron-catalyzed borylation of alkenyl and arylcarbamatesthrough the activation of a C–O bond. This protocol exhibits high efficiency, a broad substrate scope, and the late-stage borylation of biorelevant compounds, thus providing potential applications in medicinal chemistry. Moreover, this method enables orthogonal transformations of phenol derivatives and also offers good opportunities
在本文中,我们描述了通过C-O键的活化,铁催化的烯基和芳基氨基甲酸酯的硼酸酯化反应。该方案显示出高效率,广泛的底物范围以及生物相关化合物的后期硼化,因此在药物化学中提供了潜在的应用。而且,该方法能够使酚衍生物进行正交转化,并且还为合成多取代的芳烃提供了良好的机会。初步的机理研究表明,通过自由基途径的Fe II / Fe III催化循环可能与反应有关。
Transfer of Chirality in the Rhodium-Catalyzed Chemoselective and Regioselective Allylic Alkylation of Hydroxyarenes with Vinyl Aziridines
By taking advantage of chirality-transfer strategy, a chemo- and regioselectiveallylicalkylation of naphthols and phenols with vinylaziridines provides an atom-economic and efficient method for the synthesis of enantioenriched 2-vinyl-2-arylethylamine derivatives. Use of readily available starting materials, a broad substrate scope, high selectivity, mild reaction conditions, as well as versatile
Synthesis of Chiral Propargylamines, Chiral 1,2‐Dihydronaphtho[2,1‐b]furans and Naphtho[2,1‐b]furans with C‐Alkynyl N,N′‐di‐(tert‐butoxycarbonyl)‐aminals and β‐Naphthols
作者:Ningning Man、Yuming Li、Jiyang Jie、Hongyun Li、Haijun Yang、Yufen Zhao、Hua Fu
DOI:10.1002/chem.202102040
日期:2021.9.6
phosphoric acid-catalyzed in situ formation of N-(tert-butoxycarbonyl)-imines (N-Boc-imines) from the aminals, and 1,2-addition of β-naphthols to the N-Boc-imines. Chiral 1,2-dihydronaphtho[2,1-b]furans and naphtho[2,1-b]furans were prepared with satisfactory results when 10 mol% AgOAc and 20 mol% 2,6-lutidine or 1.2 equiv. of 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) were added to the resulting chiral propargylamines
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。