New Thionitrites: Synthesis, Stability, and Nitric Oxide Generation
作者:Beatrice Roy、A. du Moulinet d'Hardemare、Marc Fontecave
DOI:10.1021/jo00102a028
日期:1994.11
In order to study the influence of substitutions at the alpha and beta carbon atoms on the stability of the S-NO bond, water-soluble thionitrites RSNO have been synthesized by nitrosation of cysteamine and mercaptoethanol derivatives and characterized. H-1 and C-13 NMR spectroscopies have proven to be excellent probes for the nitrosation of thiols. In water, at physiological pH, the compounds decomposed into nitric oxide NO and the corresponding disulfides. The rate at which NO was released was very sensitive to modifications at the alpha and beta carbon atoms. Tertiary thionitrites were more stable than primary thionitrites. The beta-substituents decreased the rates of decomposition in the following order: OH > NHCOCH3 > NH3+. S-Nitrosocysteamine derivatives were greatly stabilized at low pH. The compounds described here might be convenient and useful as vehicles for spontaneous generation of nitric oxide in biological systems, at rates that can be finely tuned and controlled over a wide range.
Nitrosothiol Esters of Diclofenac: Synthesis and Pharmacological Characterization as Gastrointestinal-Sparing Prodrugs<sup>,</sup>
作者:Upul K. Bandarage、Liqing Chen、Xinqin Fang、David S. Garvey、Alicia Glavin、David R. Janero、L. Gordon Letts、Gregory J. Mercer、Joy K. Saha、Joseph D. Schroeder、Matthew J. Shumway、S. William Tam
DOI:10.1021/jm000178w
日期:2000.10.1
irritation. All S-NO-diclofenac derivatives acted as orally bioavailable prodrugs, producing significant levels of diclofenac in plasma within 15 min after oral administration to mice. At equimolar oral doses, S-NO-diclofenac derivatives (20a-21b) displayed rat antiinflammatory and analgesic activities comparable to those of diclofenac in the carrageenan-induced paw edema test and the mouse phenylbenzoquinone-induced
C4-Alkylthiols with activity against Moraxella catarrhalis and Mycobacterium tuberculosis
作者:Maya B. Kostova、Carey J. Myers、Tim N. Beck、Balbina J. Plotkin、Jacalyn M. Green、Helena I.M. Boshoff、Clifton E. Barry、Jeffrey R. Deschamps、Monika I. Konaklieva
DOI:10.1016/j.bmc.2011.09.030
日期:2011.11
Antimicrobial resistance represents a global threat to healthcare. The ability to adequately treat infectious diseases is increasingly under siege due to the emergence of drug-resistant microorganisms. New approaches to drug development are especially needed to target organisms that exhibit broad antibiotic resistance due to expression of beta-lactamases which is the most common mechanism by which bacteria become resistant to beta-lactam antibiotics. We designed and synthesized 20 novel monocyclic beta-lactams with alkyl-and aryl-thio moieties at C4, and subsequently tested these for antibacterial activity. These compounds demonstrated intrinsic activity against serine beta-lactamase producing Mycobacterium tuberculosis wild type strain (Mtb) and multiple (n = 6) beta-lactamase producing Moraxella catarrhalis clinical isolates. (C) 2011 Elsevier Ltd. All rights reserved.