Novel 5-substituted 1H-tetrazoles as cyclooxygenase-2 (COX-2) inhibitors
摘要:
A series of novel 5-substituted 1H-tetrazoles as cyclooxygenase-2 (COX-2) inhibitors was prepared via treatment of various diaryl amides with tetrachlorosilane/sodium azide. All compounds were tested in cyclooxygenase (COX) assays in vitro to determine COX-1 and COX-2 inhibitory potency and selectivity. Tetrazoles contained a methylsulfonyl or sulfonamide group as COX-2 pharmacophore displayed only low inhibitory potency towards COX-2. Most potent compounds showed IC50 values of 6 and 7 mu M for COX-2. All compounds showed IC50 values greater 100 mu M for COX-1 inhibition. (C) 2012 Elsevier Ltd. All rights reserved.
Manganese-Mediated Reductive Transamidation of Tertiary Amides with Nitroarenes
作者:Chi Wai Cheung、Jun-An Ma、Xile Hu
DOI:10.1021/jacs.8b03739
日期:2018.6.6
an important class of organic compounds, which have widespread industrial applications. Transamidation of amides is a convenient method to generate new amides from existing ones. Tertiary amides, however, are challenging substrates for transamidation. Here we describe an unconventional approach to the transamidation of tertiary amides using nitroarenes as the nitrogen source under reductive conditions
Amide synthesis <i>via</i> nickel-catalysed reductive aminocarbonylation of aryl halides with nitroarenes
作者:Chi Wai Cheung、Marten Leendert Ploeger、Xile Hu
DOI:10.1039/c7sc03950f
日期:——
Aminocarbonylation of arylhalides is one of the most useful methods in amide synthesis, but nitroarenes have not been used as a nitrogen source in this method even though they are more economical and accessible than anilines. Reported here is the development of nickel catalysis for the first three-component reactions of arylhalides, Co2(CO)8, and nitroarenes under reductive conditions to produce aryl amides. A
Visible-Light-Mediated Decarboxylation/Oxidative Amidation of α-Keto Acids with Amines under Mild Reaction Conditions Using O<sub>2</sub>
作者:Jie Liu、Qiang Liu、Hong Yi、Chu Qin、Ruopeng Bai、Xiaotian Qi、Yu Lan、Aiwen Lei
DOI:10.1002/anie.201308614
日期:2014.1.7
visible‐light photoredox catalysis and radical reactions. A novel, simple, and efficient radical oxidative decarboxylative coupling with the assistant of the photocatalyst [Ru(phen)3]Cl2 is described. Various functional groups are well‐tolerated in this reaction and thus provides a new approach to developing advanced methods for aerobic oxidativedecarboxylation. The preliminary mechanistic studies revealed
Catalyst- and Supporting-Electrolyte-Free Electrosynthesis of Benzothiazoles and Thiazolopyridines in Continuous Flow
作者:Ana A. Folgueiras-Amador、Xiang-Yang Qian、Hai-Chao Xu、Thomas Wirth
DOI:10.1002/chem.201705016
日期:2018.1.9
N‐arylthioamides have been converted to the corresponding benzothiazoles in good to excellent yields and with high current efficiencies. This transformation is achieved using only electricity and laboratory grade solvent, avoiding degassing or the use of inert atmosphere. This work highlights three advantages of electrochemistry in flow, which is (i) a supporting electrolyte‐free reaction, (ii) an easy scale‐up
Aryl C-N bond formation by electrophilic amination of diarylcadmium reagents with<i>O</i>-substituted ketoximes
作者:Tahir Daşkapan、Adem Korkmaz
DOI:10.1080/00397911.2016.1177729
日期:2016.5.2
under milder reaction conditions and they form corresponding arylamines in higher yields. CuCN cannot help dialkyl-, dicycloalky-, and dibenzylcadmium reagents to react with ketoxime. Our Aryl C-N bondformation method does not include cadmium excretion into the environment. GRAPHICAL ABSTRACT