Piperazine as a Linker for Incorporating the Nitric Oxide-Releasing Diazeniumdiolate Group into Other Biomedically Relevant Functional Molecules
作者:Joseph E. Saavedra、Melissa N. Booth、Joseph A. Hrabie、Keith M. Davies、Larry K. Keefer
DOI:10.1021/jo9901539
日期:1999.7.1
in which E = Na and R = dansyl and "MOM-PIPERAZI/NO" (E = CH3OCH2, R = H), whose half-life for NO release was estimated as 17 days. The latter agent has made possible the conversion of poly(vinyl chloride) and phosphatidylethanolamine to NO-releasing derivatives. This chemistry should allow introduction of diazeniumdiolate groups into a wide variety of natural products, drugs, polymers, and other molecules
已经设计了合成程序以利用双官能胺哌嗪 (pip) 作为能够将释放一氧化氮 (NO) 的二氮烯二醇官能团 [N(O)NO] 连接到多种生物医学有用分子的连接体。其中一个氨基带有二氮烯二醇酯,它可以根据需要在氧上被取代以控制其离解为 NO,而另一个用于提供适合与需要 NO 供体能力的分子共价键合的位点。结构为 R-pip-N(O)[分子式:见正文]NOE 的 N,N'-二取代哌嗪是通过使用氨基的亲核特性或通过将其转化为亲电部分与亲核中心反应来制备的在要衍生的分子中。据报道,其中 E = CH3 和 R 基团与 N'-氮结合的例子:通过酰胺键与药物布洛芬和氨基酸衍生物 N-乙酰甲硫氨酸的羧基相连;通过尿素分组到受保护赖氨酸的ε-氨基;通过氨基甲酸酯键连接到聚(乙二醇);并通过替换烟酰胺和腺苷的 NH2 氮。通过引入 BrCH2CH2OSO2Cl 作为一种新型、高效的溴乙基化剂,促进了 E = 乙
Synthesis of Diazen-1-ium-1,2-diolates Monitored by the “NOtizer” Apparatus: Relationship between Formation Rates, Molecular Structure and the Release of Nitric Oxide
作者:Joerg Konter、Gamal El-Din A. A. Abuo-Rahma、Ali El-Emam、Jochen Lehmann
DOI:10.1002/ejoc.200600662
日期:2007.2
generally prepared from secondary amines and nitric oxide and are compounds of first choice for the direct release of nitric oxide (NO). First, we report on the relationships between the structures of the amines and the formation rates of the corresponding NONOates, second on the structures of the NONOates and the rate of NO release and finally between the rates of NONOate formation and NO release from these
氮结合的diazen-1-ium-1,2-diolates(diazeniumdiolates,“NONOates”,“solid NO”)通常由仲胺和一氧化氮制备,是直接释放一氧化氮(NO )。首先,我们报告了胺的结构与相应 NONOates 形成速率之间的关系,其次报告了 NONOates 的结构和 NO 释放速率之间的关系,最后是 NONOate 形成速率与这些物种的 NO 释放速率之间的关系。通过使用 NOtizer 监测 NO 压力的降低,使用一系列不同大小和取代的环状和脂肪族胺来量化胺对 NO 的反应性,NOtizer 是为这项研究开发的一种装置。NO 的释放是用 NO 敏感电极通过电流测量法测量的,新型二氮烯二醇的半衰期由紫外光谱法确定。发现胺侧链中的空间位阻和杂原子取代基降低了 NONOates 钠盐的形成速率,也减缓了 NO 从它们中的释放。在哌啶-2-羧酸衍生物中发现了
NO-donors. Part 171: Synthesis and antimicrobial activity of novel ketoconazole–NO-donor hybrid compounds
作者:Joerg Konter、Ute Möllmann、Jochen Lehmann
DOI:10.1016/j.bmc.2008.05.008
日期:2008.9
Novel hybrid compounds combining the antifungal drug ketoconazole with a diazen-1-ium-1,2-diolate or an organic nitrate moiety and the corresponding NO-donors without ketoconazole were synthesized and their activities against a broad variety of fungal strains were tested. Hybridization modifies the spectrum of antimicrobial activities and generally, the ketoconazole-NO-donor hybrids are more potent than ketoconazole. The NO-donors alone show insufficient effectiveness. (C) 2008 Elsevier Ltd. All rights reserved.
NO-donors, part 9 [1]: diazeniumdiolates inhibit human platelet aggregation and induce a transient vasodilatation of porcine pulmonary arteries in accordance with the NO-releasing rates
作者:Gamal El Din A.A. Abuo-Rahma、Axel Horstmann、Mohamed F. Radwan、Ali El-Emam、Erika Glusa、Jochen Lehmann
DOI:10.1016/j.ejmech.2004.11.003
日期:2005.3
Diazeniumdiolates (NONOates), among them a ciprofloxacin-diazeniumdiolate hybrid compound, were synthesized and the pH-, temperature- and structure-dependent liberation of nitric oxide (NO) was monitored by laser magnetic resonance spectroscopy (LMRS). The compounds induced a transient and reversible relaxation (EC50 8.3-150 nM) of pulmonary arteries independently from intact endothelium by stimulation of guanylyl cyclase (sGC). Increase in vascular cGMP was observed and blocking sGC with ODQ, an inhibitor of the NO-sensitive guanylyl cyclase, induced a rightward shift of the concentration-response curves. Repeated exposure did not show homologous desensitization. ADP-induced platelet aggregation (IC50 = 0.15-3 mu M, IC50 for SNP: 2 mu M) and collagen-induced aggregation were potently inhibited. Preincubation with ODQ also diminished these inhibitory effects. (c) 2005 Elsevier SAS. All rights reserved.
The Secondary Amine/Nitric Oxide Complex Ion R<sub>2</sub>N[N(O)NO]<sup>-</sup> as Nucleophile and Leaving Group in S<sub>N</sub>Ar Reactions
作者:Joseph E. Saavedra、Aloka Srinivasan、Challice L. Bonifant、Jingxi Chu、Anna P. Shanklin、Judith L. Flippen-Anderson、William G. Rice、Jim A. Turpin、Keith M. Davies、Larry K. Keefer
DOI:10.1021/jo0016529
日期:2001.5.1
the cis arrangement of the oxygens were confirmed by X-ray crystallography. Displacement by various nucleophiles showed R(2)N[N(O)NO](-) to be a reasonably good leaving group, with rate constants for displacement by hydroxide, methoxide, and isopropylamine that were between those of chloride and fluoride in the S(N)Ar reactions we surveyed. The Meisenheimer intermediate could be spectrally observed. These