Synthesis of Some Novel 2,6- Dimethoxyhydroquinone-3- mercaptoacetyl-peptide Conjugates as Potential Antitumor Agents

2, 6 - D imethoxyhydroquinon e - 3 -mere aptoac et ic ac id (D M Q -MA) I -3 is a syntheti cderivative of 2, 6 - d imethoxyp -b enzoqu inone (D M Q )#, whi oh is a n atUral fermentedproduct of wheat germ and was found to have a wide spectrUm of cytotoxicity againstvarious tUmor cell lines under the synergistic activation of L-ascorbic acid as reported byG.A.Szents. Owing to the very low aqueous solubility of DMQ, which is an apparentdisadvantage for the development as a vaccine, we prep…     

MEASURING OPTIMAL CONNECTIONS IN LARGE NETWORKS: A NEW ALGORITHM AND ITS APPLICATIONS

Researchers have identified several problems in measuring the strongest path connecting pairs of actors in valued graphs. To address these problems, it has been proposed that average path value be used to indicate optimal connections between dyads. However, a lack of proper computer algorithm and its implementation has hindered a wide-range application of the proposed solution. In this paper we develop a computer algorithm and fully implement it with four JAVA programs, which are available on request. These programs produce an optimal connection matrix, which is subsequently inputted into UCINET for further multidimensional scaling and clustering analysis. We demonstrate this procedure with a data matrix containing 38 organizations in information technology. We discuss the methodological implications of the application of our algorithm to future social network studies.     

Efficient Syntheses of Methyl 2-Amino-2-Deoxy-3,4,6-Tri-O-Benzyl-α-D-Glucopyranoside and its 2-tert-Butoxycarbonylamino- and 2-Methylamino Derivatives from N-Acetyl-D-Glucosamine

ABSTRACT

The synthesis of the title compounds started with N-acetylglucosamine which was converted into the corresponding methyl glycoside and O-protected with benzyl groups. Subsequent N-protection as its N-BOC-N-acetyl derivative and sequential removal of the N-acetyl group and of the BOC group led in good yield to the target compounds in multigram amounts.     

Thin-layer chromatographic characterization tests for basic polynuclear compounds. Application to air pollution

Summary A group of methods for characterization and differentiation of various classes of basic aromatic compounds has been described. These methods are based on changes in fluorescent color with sulfuric acid, trifluoroacetic acid and aqueous acid. The classes include polycyclic hydrocarbons, aromatic carbonyl derivatives, aromatic ring carbonyl compounds, aza heterocyclic compounds, and polycyclic aromatic amines. The piperonal color test gave some selective reactions on the thin-layer plates with various polycyclic aromatic hydrocarbons. A trifluoroacetic color test gave positive results with compounds containing carbazole rings. These tests have been applied to the study of the spots separated through thin-layer chromatography of organic airborne particulates. A spectral procedure for characterizing and differentiating aromatic hydrocarbons, aromatic carbonyl derivatives, aza heterocyclic compounds, and aromatic amines is described. It uses spectrophotometry and spectrofluorometry in neutral and in acid solutions, and is being further developed.

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Zusammenfassung Eine Reihe von Methoden zur Charakterisierung und Unterscheidung verschiedener Klassen aromatischer Grundstoffe wurde beschrieben. Diese Methoden beruhen auf dem Wechsel der Fluoreszenzfarbe mit Schwefelsäure, Trifluoroessigsäure und angesäuertem Wasser. Folgende Verbindungsklassen wurden geprüft: polycyklische Kohlenwasserstoffe, aromatische Oxoverbindungen und Ringketone, heterocyklische Azaverbindungen und polycyklische aromatische Amine. Die Farbreaktion mit Piperonal ergab einige selektive Nachweise auf Dünnschichtplatten für verschiedene polycyklische aromatische Kohlenwasserstoffe. Trifluoressigsäure gab Farbreaktionen mit Carbazolringverbindungen. Diese Reaktionen wurden zur Untersuchung von Dünnschichtchromatogrammen organischer Luftbestandteilchen verwendet. Weiters wurde ein spektralanalytisches Verfahren zur Charakterisierung und Unterscheidung aromatischer Kohlenwasserstoffe, Oxoverbindungen, heterocyklischer Azaverbindungen und aromatischer Amine beschrieben. Es beruht auf der Spektrophotometrie und Fluoreszenzmessung neutraler und saurer Lösungen und soll weiterentwickelt werden.

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Résumé On décrit un ensemble de procédés de caractérisation et de différenciation de classes variées de composés aromatiques fondamentaux. Ces méthodes sont fondées sur l'emploi de couleurs de fluorescence dues à l'acide sulfurique, l'acide trifluoroacétique et à un acide aqueux. Ces classes comprennent les hydrocarbures polycycliques, les dérivés aromatiques carbonylés, les composes carbonylés à noyau aromatique, les composés azahétérocycliques et les aminés aromatiques polycycliques. L'essai coloré au pipéronal a donné des réactions sélectives sur des plaques en couches minces avec différents hydrocarbures aromatiques polycycliques. Un essai coloré à l'acide trifluoroacétique a donné des résultats positifs avec des composés contenant des noyaux carbazoliques. On a appliqué ces essais à l'étude des taches séparées par chromatographie en couche mince de particules organiques en suspension dans l'air. On décrit un procédé d'analyse spectrale pour caractériser et différencier les hydrocarbures aromatiques, les dérivés aromatiques carbonylés, les composés azahétérocycliques et les amines aromatiques. Ce dernier utilise la spectrophotométrie en solutions neutres et acides et est encore en cours de développement.

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Dedicated to Prof.A. A. Benedetti-Pichler on the occasion of his 70th birthday.     

Antibacterial potential of N-(2-furylmethylidene)-1, 3, 4-thiadiazole-2-amine: Experimental and theoretical investigations

Recently, a lot of interest has been attributed to the Schiff base compound because of its wide range of biological activities which include: antibacterial, antifungal, antima larial, including; antiproliferative, antiviral, and antipyretic. In this research work, N-(2-furylmethylidene)-1, 3, 4-thiadiazole- 2-amine gotten from o-phenylenediamine and 5- methoxysalicaldehyde was produced and characterized using UV–Visible, FT-IR, ¹H NMR, ¹³C NMR, and GC-MS along with molecular modeling using density functional theory (DFT) and molecular docking approach. The results obtained indicated that the Schiff base exhibited antimicrobial action against all the tested microbes except Candidaalbicans isolate, which exhibited zero diameter zone of inhibition. The theoretical investigations of the synthesized compounds were computed applying density functional theory at the B3LYP/6–31++G (d, p) level of theory and in silico molecular docking simulation. In comparing binding affinity energies and binding poses of the studied compound and the standard drug (ampicillin), the deduction that the molecular docking analysis results are in good agreement with in vitro analysis of the synthesized compounds can be made.