Synthesis of N-Aryl Oxindole Nitrones through a Metal-Free Selective N-Arylation Process
摘要:
An efficient selective N-arylation of 3-(hydroxyimino)indolin-2-ones with diaryliodonium salts to prepare (Z)-N-aryl oxindole nitrones has been achieved under simple base-mediated conditions. The reaction tolerated a variety of diaryliodonium salts with diverse and sensitive functional groups. Studies on the oxime structures revealed that the pyrroline ring and carbonyl group in 3-(hydroxyimino)indolin-2-ones played important roles in the selective N-arylation process. The N-aryl oxindole nitrones could be prepared rapidly and easily at the gram scale.
Oxidations of Dihydroxyalkanoates to Vicinal Tricarbonyl Compounds with a 4-BzoTEMPO-Sodium Bromite System or by Indirect Electrolysis Using 4-BzoTEMPO and Bromide Ion
A metal‐free, one‐potsynthesis of 1,2‐naphthoquinone was accomplished from 2‐naphthol by utilizing economically cheap NBS under open air conditions. Initial formation of 1,1‐dibromonaphthalen‐2‐one and subsequent transformation afforded the 1,2‐naphthoquinone. This oxidation was completed within 30 min and had broad substrate scope. Moreover, this system tolerated heterocyclic systems and was also
A novel method of synthesis of 1,2-diketones from 1,2-diols using N-bromosuccinimide
作者:Jitender M Khurana、Bhaskar M Kandpal
DOI:10.1016/s0040-4039(03)01075-x
日期:2003.6
A simple and convenient procedure is reported for the synthesis of benzils and aliphatic 1,2-diketones of cyclic and open chain compounds from corresponding hydrobenzoins and 1,2-diols by refluxing with N-bromosuccinimide in carbon tetrachloride in presence or absence of pyridine.
Displacement of Dinitrogen by Oxygen: A Methodology for the Catalytic Conversion of Diazocarbonyl Compounds to Ketocarbonyl Compounds by 2,6-Dichloropyridine-<i>N</i>-oxide
作者:Yang Yu、Qiang Sha、Hui Cui、Kory S. Chandler、Michael P. Doyle
DOI:10.1021/acs.orglett.7b03912
日期:2018.2.2
Dirhodium(II) catalyzed dinitrogen extrusion from diazocarbonyl compounds by 2,6-dichloropyridine-N-oxide forms ketocarbonyl compounds in near-quantitative yields. Reactions occur at room temperature, and the pyridine product does not coordinate with dirhodium(II) to inhibit catalysis. Anhydrous tricarbonyl compounds, as well as dicarbonyl compounds, are conveniently prepared by this methodology, and
Addition of Mixed (Alkenyl)dialkylzincates to Vicinal Diketo Esters
作者:Lars Selter、Klaus Harms、Ulrich Koert
DOI:10.1002/ejoc.201601598
日期:2017.2.24
Methods for the regioselective alkylation, arylation and alkenylation of α,β-diketoesters using organozinc reagents are reported. Alkylation and arylation in α-position is possible using diorgano zinc compounds. Alkenylation can be achieved using mixed alkenyl-dineopentyl zincates.
<i>p</i>-TSA-catalyzed a simple and efficient one-pot eco-friendly synthesis of functionalized new isoxazolyl-4-hydroxyindole-3-carboxylate derivatives in aqueous medium
作者:Nallamothu Vanaja Rani、Ravindhranath Kunta
DOI:10.1080/00397911.2020.1825743
日期:2021.1.17
A simple, efficient, cost-effective and one-pot eco-friendly protocol has been developed for the synthesis of new isoxazolyl-4-hydroxyindole-3-carboxylate derivatives by using 4-amino-3-methyl-5-st...