Minisci aroylation of N-heterocycles using choline persulfate in water under mild conditions
作者:Joydev K. Laha、Ummehani Tinwala、Mandeep Kaur Hunjan
DOI:10.1039/d1nj05068k
日期:——
objective of this work was to develop persulfate mediated oxidative transformations that can be performed nearly at room temperature using water as a solvent. This report describes modified Minisci aroylation of isoquinolines with arylglyoxylic acids using choline persulfate and its pre-composition (choline acetate and K2S2O8) in water at 40 °C. A few other nitrogen heterocycles were also utilized affording
金属过硫酸盐介导的热氧化有机转化总是需要更高的温度并且经常使用有机溶剂。这项工作的目的是开发过硫酸盐介导的氧化转化,它可以在几乎室温下使用水作为溶剂进行。本报告描述了使用过硫酸胆碱及其预组合物(醋酸胆碱和 K 2 S 2 O 8) 在 40 °C 的水中。还使用了一些其他氮杂环,以良好到极好的产率提供各种芳酰化产物。与可能产生金属盐副产物的金属过硫酸盐不同,本文报道的化学的一个关键特征包括使用含有可生物降解胆碱的环境无害的过硫酸胆碱作为抗衡阳离子,Minisci 反应在 40 °C 下作为唯一的溶剂证明,和过硫酸盐的非常规活化。
Aroylation of Electron-Rich Pyrroles under Minisci Reaction Conditions
作者:Joydev K. Laha、Mandeep Kaur Hunjan、Shalakha Hegde、Anjali Gupta
DOI:10.1021/acs.orglett.0c00041
日期:2020.2.21
The development of Minisci acylation on electron-rich pyrroles under silver-free neutral conditions has been reported featuring the regioselective monoacylation of (NH)-free pyrroles. Unlike conventional Minisci conditions, the avoidance of any acid that could result in the polymerization of pyrroles was the key to success. The umpolung reactivity of the nucleophilic acyl radical, generated in situ
Iodine-mediated intramolecular amination of ketones: the synthesis of 2-acylindoles and 2-acylindolines by tuning N-protecting groups
作者:Wen-Chao Gao、Shan Jiang、Ruo-Lin Wang、Chi Zhang
DOI:10.1039/c3cc40797g
日期:——
A general method for constructing both 2-acylindoles and 2-acylindolines via I2-mediated intramolecular C-N bond formation is presented, and the selective formation of either 2-acylindoles or 2-acylindolines just depends on the nitrogen protecting groups used in the same substrate skeletons.
Batting the ylides: A simple procedure carried out under mild conditions allows the direct and efficientsynthesis of structurally diverse indoles. This approach involves a cascadereaction of sulfurylides and N‐(ortho‐chloromethyl)arylamides (see scheme).
Copper-catalyzed tri- or tetrafunctionalization of alkenylboronic acids to prepare tetrahydrocarbazol-1-ones and indolo[2,3-<i>a</i>]carbazoles
作者:Hong-Yan Bi、Cheng-Jing Li、Cui Wei、Cui Liang、Dong-Liang Mo
DOI:10.1039/d0gc01514h
日期:——
We describe a cascade strategy for tri- or tetrafunctionalization of alkenylboronic acids to prepare diverse tetrahydrocarbazol-1-ones and indolo[2,3-a]carbazoles in good yields with N-hydroxybenzotriazin-4-one (HOOBT) and arylhydrazines as oxygen and nitrogen sources, respectively. Mechanistic studies reveal that the domino reaction undergoes the copper-catalyzed Chan–Lam reaction, [2,3]-rearrangement
我们描述了烯基硼酸的三或四官能化的级联策略,以制备具有N的高收率的各种四氢咔唑-1-酮和吲哚[2,3- a ]咔唑-羟基苯并三嗪-4-酮(HOOBT)和芳基肼分别作为氧和氮源。机理研究表明,多米诺反应在一锅法反应中经过五个步骤,经历了铜催化的Chan-Lam反应,[2,3]重排,亲核取代,氧化和顺序[3,3]重排。该反应显示出广泛的底物范围,并且可以耐受多种官能团。更重要的是,该反应易于以克为单位进行,并且产物可以通过简单的萃取,洗涤和重结晶进行纯化,而无需快速柱色谱。本协议的特点是易于获得的起始原料,高位标记的功能化,一锅中的五步串联,多个C–C / C–O / C–N键形成以及吲哚图案的多样性。