2527-03-9Relevant articles and documents
No-carrier-added labeling of the neuroprotective Ebselen with selenium-73 and selenium-75
Helfer, Andreas,Ermert, Johannes,Humpert, Sven,Coenen, Heinz H.
, p. 141 - 145 (2015)
Selenium-73 is a positron emitting non-standard radionuclide, which is suitable for positron emission tomography. A copper-catalyzed reaction allowed no-carrier-added labeling of the anti-inflammatory seleno-organic compound Ebselen with 73Se and 75Se under addition of sulfur carrier in a one-step reaction. The new authentically labeled radioselenium molecule is thus available for preclinical evaluation and positron emission tomography studies.
Structure-Guided Discovery of the Novel Covalent Allosteric Site and Covalent Inhibitors of Fructose-1,6-Bisphosphate Aldolase to Overcome the Azole Resistance of Candidiasis
Cao, Hongxuan,Chen, Han,Han, Xinya,Huang, Yunyuan,Liu, Jiaqi,Peng, Chao,Rao, Li,Ren, Yanliang,Sheng, Chunquan,Su, Chen,Tu, Jie,Wan, Chen,Wan, Jian,Wen, Wuqiang
, p. 2656 - 2674 (2022/02/09)
Fructose-1,6-bisphosphate aldolase (FBA) represents an attractive new antifungal target. Here, we employed a structure-based optimization strategy to discover a novel covalent binding site (C292 site) and the first-in-class covalent allosteric inhibitors
Structure-Activity Studies Reveal Scope for Optimisation of Ebselen-Type Inhibition of SARS-CoV-2 Main Protease
Thun-Hohenstein, Siegfried T. D.,Suits, Timothy F.,Malla, Tika R.,Tumber, Anthony,Brewitz, Lennart,Choudhry, Hani,Salah, Eidarus,Schofield, Christopher J.
, (2021/12/30)
The reactive organoselenium compound ebselen is being investigated for treatment of coronavirus disease 2019 (COVID-19) and other diseases. We report structure-activity studies on sulfur analogues of ebselen with the Severe Acute Respiratory Syndrome coronavirus 2 (SARS-CoV-2) main protease (Mpro), employing turnover and protein-observed mass spectrometry-based assays. The results reveal scope for optimisation of ebselen/ebselen derivative- mediated inhibition of Mpro, particularly with respect to improved selectivity.
Electrochemical synthesis for benzisothiazol-3(2H)-ones by dehydrogenative N[sbnd]S bond formation
Chen, Junmin,Sheng, Shouri,Xiong, Zhiqiang,Zhong, Qihao
, (2021/08/26)
Herein, we report an electrochemical method for the synthesis of benzisothiazol-3(2H)-ones from 2-mercaptobenzamides. The electrochemical reaction proceeds through intramolecular N[sbnd]H/S[sbnd]H coupling cyclization reaction by generating H2 as the nonhazardous side product. Moreover, the developed procedure is highly advantageous due to its short reaction time, mild conditions and wide substrate scope without the employment of metal catalyst and exogenous-oxidant.2009 Elsevier Ltd. All rights reserved.
High-throughput tandem-microwell assay for ammonia repositions FDA-Approved drugs to inhibit Helicobacter pylori urease
Fang, Houqin,Huang, Shengshuo,Li, Fangzheng,Liao, Lujian,Liu, Fan,Liu, Qi,Wu, Fang,Wu, Xin-Yan,Xiao, Zhuping,Xu, Jinyi,Yu, Jing,Zhang, Yan-Xia,Zhou, Yueyang
, (2021/11/01)
To date, little attempt has been made to develop new treatments for Helicobacter pylori (H. pylori), although the community is aware of the shortage of treatments for H. pylori. In this study, we developed a 192-tandem-microwell-based high-throughput assay for ammonia that is a known virulence factor of H. pylori and a product of urease. We could identify few drugs, that is, panobinostat, dacinostat, ebselen, captan, and disulfiram, to potently inhibit the activity of ureases from bacterial or plant species. These inhibitors suppress the activity of urease via substrate-competitive or covalent-allosteric mechanism, but all except captan prevent the antibiotic-resistant H. pylori strain from killing human gastric cells, with a more pronounced effect than acetohydroxamic acid, a well-known urease inhibitor and clinically used drug for the treatment of bacterial infection. This study offers several bases for the development of new treatments for urease-containing pathogens and to study the mechanism responsible for the regulation of urease activity.
Novel synthesis method of N-substituted benzisothiazoline-3-ketone derivative
-
Paragraph 0053-0055, (2020/07/02)
The invention discloses a novel synthesis method of an N-substituted benzisothiazoline-3-ketone derivative. The preparation method comprises the following steps: by taking a dithiosalicylic acid derivative and sulfur as raw materials, introducing chlorine or bromine to obtain a halogenated thiobenzoyl halide derivative, then preferably dropwise adding a mixed solution of primary amine and tertiaryamine, and carrying out reaction and ring closing to obtain the N-substituted benzisothiazole-3-ketone. The method disclosed by the invention is simple in process, safe and controllable, and easy forindustrial large-scale production.
Bioisosteric investigation of ebselen: Synthesis and in vitro characterization of 1,2-benzisothiazol-3(2H)-one derivatives as potent New Delhi metallo-β-lactamase inhibitors
Jin, Wen Bin,Xu, Chen,Cheung, Qipeng,Gao, Wei,Zeng, Ping,Liu, Jun,Chan, Edward W.C.,Leung, Yun-Chung,Chan, Tak Hang,Wong, Kwok-Yin,Chen, Sheng,Chan, Kin-Fai
, (2020/04/30)
Carbapenem-resistant Enterobacteriaceae (CRE) producing New Delhi metallo-β-lactamase (NDM-1) cause untreatable bacterial infections, posing a significant threat to human health. In the present study, by employing the concept of bioisosteric replacement of the selenium moiety of ebselen, we have designed, synthesized and characterized a small compound library of 2-substituted 1,2-benzisothiazol-3(2H)-one derivatives and related compounds for evaluating their cytotoxicity and synergistic activity in combination with meropenem against the E. coli Tg1 (NDM-1) strain. The most promising compound 3a demonstrated potent synergistic activity against a panel of clinically isolated NDM-1 positive CRE strains with FICI as low as 0.09. Moreover, its IC50 value and inhibition mechanism were also confirmed by using the enzyme inhibition assay and the ESI-MS analysis respectively. Importantly, compound 3a has acceptable toxicity and is not a PAINS. Because of its structural simplicity and potent synergistic activity in combination with meropenem, we propose that compound 3a may be a promising meropenem adjuvant and a new series of such compounds may worth further investigations.
Synthetic method 1-2 - benzisothiazol -3 -one compound (by machine translation)
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, (2020/09/09)
The invention discloses a synthetic method of 1-2 - benzisothiazol -3 -one compound, and belongs to the field of chemical synthesis. 2 - 1-benzisothiazol 2 -one compounds are synthesized through acid chlorination, amidation and cyclization reaction by using the sulfenyl-substituted benzoic acid extracted from BIT process -3 - waste water as a starting raw material. The method disclosed by the invention has the advantages of mild reaction conditions, simple and convenient operation, strong practicability, less waste water, high product purity and the like, and is suitable for large-scale industrial production. The technical scheme provided by the invention is resource utilization and preparation 1 of wastewater extract produced in BIT production, and a feasible method is provided for the 2 -benzisothiazol -3 -one compound. (by machine translation)
Ebsulfur as a potent scaffold for inhibition and labelling of New Delhi metallo-β-lactamase-1 in vitro and in vivo
Su, Jianpeng,Liu, Jiayun,Chen, Cheng,Zhang, Yuejuan,Yang, Kewu
supporting information, p. 192 - 201 (2018/12/02)
The superbug infection caused by New Delhi metallo-β-lactamase (NDM-1) has grown into an emerging threat, labelling and inhibition of NDM-1 has proven challenging due to its shuttling between pathogenic bacteria. Here, we report a potent covalent scaffold, ebsulfur, for targeting the protein in vitro and in vivo. Enzymatic kinetic study indicated that eighteen ebsulfurs gained except 1a–b and 1f inhibited NDM-1, exhibiting an IC50 value ranging of 0.16–9 μM, and 1g was found to be the best, dose- and time-dependent inhibitor with an IC50 of 0.16 μM. Also, these ebsulfurs effectively restored the antibacterial activity of cefazolin against E. coli expressing NDM-1, and the best effect was observed to be from 1g, 1i and 1n, resulting in an 256-fold reduction in MIC of the antibiotic at a dose of 16 μg/mL. The equilibrium dialysis study implied that the ebsulfur disrupted the coordination of one Zn(II) ion at active site of NDM-1. Labelling of NDM-1 using a constructed fluorescent ebsulfur Ebs-R suggested that the inhibitor covalently bound to the target through SDS-PAGE analysis in vitro. Also, labelling NDM-1 in living E. coli cells with Ebs-R by confocal microscopic imaging showed the real-time distribution change process of intracellular recombinant protein NDM-1. Moreover, the cytotoxicity of these ebsulfurs against L929 mouse fibroblastic cells was tested, and their capability to restore antibacterial activity of antibiotic against clinical strains E. coli EC08 producing NDM-1 was determined. The ebsulfur scaffold proposed here is valuable for development of the covalent irreversible inhibitors of NDM-1, and also for labelling the target in vitro and in vivo.
Co-Catalyzed Intramolecular S-N Bond Formation in Water for 1,2-Benzisothiazol-3(2H)-ones and 1,2,4-Thiadiazoles Synthesis
Yang, Liting,Song, Lijuan,Tang, Shanyu,Li, Longjia,Li, Heng,Yuan, Bingxin,Yang, Guanyu
, p. 1281 - 1285 (2019/01/14)
An efficient and versatile Co-catalyzed intramolecular S-N bond formation in water to synthesize 1,2-benzisothiazol-3(2H)-one and 1,2,4-thiadiazoles derivatives in good to excellent yields was developed. The transformation showed great tolerance with a broad range of substituents. The mother liquor was able to be recycled 6 times with minor loss in product yield.
