The conversion of aldehydes into carboxylic acids using oxidizing agents is a common protocol in transformation chemistry. An efficient oxidation strategy of transformation of pyrazole‐4‐aldehydes to the corresponding acids using vanadium catalysts in the presence of 30% H2O2 as an oxidant is described. The catalytic technology was successfully applied to a range of various 4‐formylpyrazoles, and plausible
使用氧化剂将醛转化为羧酸是转化化学中的常见协议。描述了在30%H 2 O 2作为氧化剂存在下使用钒催化剂将吡唑-4-醛转化为相应酸的有效氧化策略。催化技术已成功地应用于各种4-甲酰基吡唑,并探讨了可能的机理。
Synthesis and biological evaluation of some 4-functionalized-pyrazoles as antimicrobial agents
作者:Pawan K. Sharma、Navneet Chandak、Pawan Kumar、Chetan Sharma、Kamal R. Aneja
DOI:10.1016/j.ejmech.2011.01.060
日期:2011.4
1,3-Diaryl-4-formylpyrazoles 8 bearing benzenesulfonamide moiety at position-1 were synthesized as important intermediates following Vilsmeier-Haack strategy. Aldehyde moiety of 4-formylpyrazole was then converted into carboxylic acid 9, cyano 10 and carbothioamide 11 using established procedures. Out of these 4-functionalized pyrazoles, pyrazole-4-carboxylic acids 9 and carbothioamides 11 were evaluated for their in vitro antibacterial activity against four pathogenic bacterial strains namely, Staphylococcus aureus, Bacillus subtilis (Gram-positive), Escherichia coli, Pseudomonas aeruginosa (Gram-negative), and in vitro antifungal activity against two pathogenic fungal strains namely, Aspergillus niger and Aspergillus flavus. Three tested compounds, 9e, 11b and 11f exhibited moderate antibacterial activity against Gram-positive bacteria and 9g showed moderate antifungal activity against the tested fungi. However, none of the compounds showed any activity against Gram-negative bacteria. (c) 2011 Elsevier Masson SAS. All rights reserved.
4-Functionalized 1,3-diarylpyrazoles bearing benzenesulfonamide moiety as selective potent inhibitors of the tumor associated carbonic anhydrase isoforms IX and XII
作者:Poonam Khloya、Gulsah Celik、SitaRam、Daniela Vullo、Claudiu T. Supuran、Pawan K. Sharma
DOI:10.1016/j.ejmech.2014.02.023
日期:2014.4
A library of 4-functionalized 1,3-diarylpyrazoles (3a-3h, 5a-5g and 6a-6g) was designed, synthesized and evaluated against four human carbonic anhydrase (CA, EC 4.2.1.1) isozymes representing two cytosolic isozymes hCA I and hCA II, and two transmembrane tumor associated ones, hCA IX and hCA XII. All the twenty two tested compounds exhibited excellent CA activity profile against the four CA isozymes when compared to the reference drug acetazolamide. Six of the tested compounds (3a-3b, 3f, 3h, 6a and 6b) displayed low nanomolar affinity (K-i < 5 nM) for hCA IX whereas seven compounds (3a-3b, 3d-3f, 3h and 6f) displayed K-i < 10 nM against hCA XII. In addition, they acted as selective CA inhibitors of isoforms IX and XII over the physiological isoforms I and II. (C) 2014 Elsevier Masson SAS. All rights reserved.
作者:Rehab F. Ahmed、Walaa R. Mahmoud、Nagwa M. Abdelgawad、Marwa A. Fouad、Mona F. Said
DOI:10.1016/j.ejmech.2023.115805
日期:2023.12
variable groups like sulphamoyl group as in compounds 4a-e, its bioisosteric carboxylic acid as in compounds 5a-e and 8e, ethyl carboxylate ester as in compounds 6a-e and 9a-e, which were designed as potential prodrugs, isothiazole ring as in compound 7, hydrazide derivative 10e, hydroxamic acid derivatives 11a-e and semicarbazide derivatives 12a-c,e. All the synthesized compounds were investigated for
本研究旨在设计基于吡唑苯磺酰胺核心的有效碳酸酐酶抑制剂(CAI)。合成了九个系列的取代吡唑苯磺酰胺化合物,其具有可变基团,如化合物4a-e中的氨磺酰基、化合物5a-e和8e中的生物等排羧酸、化合物6a-e和 9a-e中的羧酸乙酯,其中被设计为潜在的前药,化合物7中的异噻唑环、酰肼衍生物10e 、异羟肟酸衍生物11a-e和氨基脲衍生物12a-c,e 。研究了所有合成的化合物对两种人 CA 异构体 hCA IX 和 hCA XII 的碳酸酐酶 (CA) 抑制活性,并与乙酰唑胺(AAZ) 进行比较。此外,还根据美国 NCI 方案评估了这些化合物对 60 种癌细胞系的抗癌活性。 化合物4b 、 5b 、 5d 、 5e 、 6b 、 9b 、 9e和11b显示出对 hCA IX 和 hCA XII 两种亚型的显着抑制活性,而6e 、 9d 、 11d和11e仅与乙酰唑胺相比显示出对 hCA XII