- Ultrasound-assisted synthesis and antimicrobial activity of tetrazole-based pyrazole and pyrimidine derivatives
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New tetrazole-based pyrazole and pyrimidine derivatives were synthesized by an ultrasound irradiation method. All compounds were characterized by infrared spectroscopy (IR), 1H nuclear magnetic resonance (NMR), 13C NMR, mass spectrometry (MS) and elemental analysis and assessed in vitro for their efficacy as antimicrobial agents against four bacteria (Staphylococcus aureus, Bacillus subtilis, Escherichia coli, Pseudomonas aeruginosa) and two fungi (Candida albicans, Aspergillus Niger). Compounds 8a, 8e, 9a, 9b and 9e show potent activity against the tested strains compared to the reference drugs chloramphenicol and clotrimazole.
- Dofe, Vidya S.,Sarkate, Aniket P.,Shaikh, Zarina M.,Gill, Charansingh H.
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- Size-selective catalysts in five functionalized porous coordination polymers with unsaturated zinc centers
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The five reported structural isomorphic porous coordination polymers (PCPs) 1-5, namely, [Zn(L)(ip) (1), Zn(L)(aip) (2), Zn(L)(hip) (3), Zn(L)(nip) (4), and Zn(L)(HBTC) (5) (L = N4,N4′-di(pyridine-4-yl)biphenyl-4,4′-dicarboxamide, H2ip = isophthalic acid, H2aip = 5-aminoisophthalic acid, H2hip = 5-hydroxyisophthalic acid, H2nip = 5-nitroisophthalic acid, H3BTC = 1,3,5-benzenetricarboxylic acid)] were used to catalyze the acetylation of phenol. All these heterogeneous catalysts exhibit good catalytic efficiency and size-selectivity toward the acetylation of phenols owing to their unsaturated metal centers, non-coordinated amide, and suitable channel size and shape. Among them, 2 displays the highest catalytic activity and excellent cooperative catalysis due to the presence of basic non-coordinated amide groups.
- Deng, Dongsheng,Guo, Hui,Ji, Baoming,Wang, Weizhou,Ma, Lufang,Luo, Feng
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p. 12611 - 12616
(2017/11/06)
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- Synthesis, antimicrobial activity and anti-biofilm activity of novel tetrazole derivatives
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In the development of antimicrobial agents, we designed and synthesized novel tetrazole derivatives. The structures of compounds 6a-f and 7a-f were characterized by IR, 1H NMR, 13C NMR, MS and elemental analysis. These compounds were tested for their antimicrobial activity against a series of strains Staphylococcus aureus, Bacillus subtilis, Escherichia coli, and Pseudomonas aeruginosa and for antifungal activity against the strains Candida albicans, Candida glabrata, and Candida tropicalis. Compounds 6e, 6f, 7a, and 7f exhibit potent antimicrobial activities compared to the reference drugs streptomycin and miconazole. Tetrazole derivatives 7a-f also inhibit biofilm formation and compound 7f exhibits best anti-biofilm activity with a biofilm inhibitory concentration (BIC) as low as 0.9 μm.
- Dofe, Vidya S.,Sarkate, Aniket P.,Kathwate, Santosh H.,Gill, Charansingh H.
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p. 325 - 330
(2017/08/18)
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- Photochemistry of aroyloxiranes: Substituent effect on oxepinones and hydroxyalkenones formation
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The photo-irradiation of some aroyloxiranes with Pyrex filtered UV-light from 125?W medium pressure Hg lamp has been described. These compounds furnished the 2-aryl-4,10-dihydrofuro[3,2-c][1]benzoxepin-10-ones and the hydroxyalkenones by the photochemical irradiation. The product(s) formation/distribution in terms of oxepinones and the hydroxyalkenones largely depended upon the nature of the substituent: the oxiranes having electron-donating groups in their benzoyl moiety gave the hydroxyalkenones while oxiranes having electron-withdrawing groups furnished the oxepinones as the major products. The formation of oxepinones has been envisaged to occur through the heterolytic [Formula presented] bond cleavage of epoxide to give carbonyl ylide intermediates followed by the furo-oxepinone ring formation via [3+2] cycloaddition and of hydroxyalkenones through the initial β-H abstraction followed by epoxide ring opening. The structures of all the compounds (substrates and photoproducts) have been determined on the basis of their spectral data (IR, NMR and Mass).
- Dalal, Aarti,Khanna, Radhika,Berar, Urmila,Kamboj, Ramesh C.
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p. 238 - 245
(2016/07/22)
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- A new ferrocene-based bulky pyridine as an efficient reusable homogeneous catalyst
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An effective approach to reusing a homogeneous catalyst has been demonstrated. A ferrocene-based bulky pyridine has been synthesized and utilized as a homogeneous catalyst for the synthesis of benzoylfumarates as well as for acetylation. After the reaction, the catalyst was separated by simple precipitation and reused without appreciable loss of activity. The Royal Society of Chemistry 2013.
- Kashyap, Bishwapran,Phukan, Prodeep
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p. 15327 - 15336
(2013/09/02)
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- Synthesis of hydrazones schiff bases and microbiological evaluation of lsonicotinoyl hydrazide with different acetophenone
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A series of hydrazones Schiff bases compounds have been synthesized by reacting isonicotinoyl hydrazide with 2-hydroxy-5-chloro acetophenone, 2-hydroxy-5-methyl acetophenone, 2-hydroxy-5-carboxy acetophenone, 2,5-dihydroxy acetophenone, 2-hydroxy-5-chloro-4-methyl acetophenone, 2-hydroxy-5-chloro-3- nitro acetophenone, 2-hydroxy-5-methyl-3-nitro acetophenone and 2-hydroxy-5-bromo acetophenone. The Schiff bases have been evaluated for the antifungal and antibacterial activities.
- Kelode,Mandlik,Aswar
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scheme or table
p. 1053 - 1062
(2012/04/04)
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- Use of 4-cyanocoumarins as dienophiles in a facile synthesis of highly substituted dibenzopyranones
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(Chemical Equation Presented) A new synthesis of dibenzopyranones 14 is reported via the Diels-Alder cycloaddition of 4-cyanocoumarins 12 with 1-silyloxydienes 10 to give the adducts 13 which are then converted into 14 in one step via treatment with base and loss of the cyano and silyloxy groups.
- Jung, Michael E.,Allen, Damian A.
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supporting information; scheme or table
p. 757 - 760
(2009/08/07)
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- Synthesis and evaluation of [2-(4-quinolyloxy)phenyl]methanone derivatives: Novel selective inhibitors of transforming growth factor-β kinase
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We synthesized and evaluated various [2-(4-quinolyloxy)phenyl]methanone derivatives. These compounds had novel chemical structures that were distinct from those of previously reported inhibitors. Biological data suggested that these compounds inhibited transforming growth factor-β signaling by interacting with the ATP-binding pocket of the transforming growth factor-β type I receptor kinase domain. Here, we report on the synthesis and structure-activity relationships of the compounds in this series.
- Shimizu, Toshiyuki,Kimura, Kaname,Sakai, Teruyuki,Kawakami, Kazuki,Miyazaki, Tetsuko,Nakouji, Masayoshi,Ogawa, Akira,Ohuchi, Hitomi,Shimizu, Kiyoshi
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supporting information; experimental part
p. 3326 - 3329
(2009/04/06)
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- Electrostatic catalysis by ionic aggregates: Scope and limitations of Mg(ClO4)2 as acylation catalyst
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Alkali and alkaline earth metal perchlorates exhibit electrostatic catalysis in the activation of anhydrides for the acylation reaction. Perchlorates with higher values of the charge-size function of the metal ion exhibit better catalytic activity following the order Mg(ClO4) 2>Ba(ClO4)2>LiClO4. Acylation of structurally diverse phenols, thiols, alcohols, and amines have been carried out with stoichiometric amounts of anhydride at room temperature under solvent free conditions in the presence of catalytic amount of Mg(ClO4) 2. Sterically hindered and electron deficient phenols are efficiently acylated. Acylation with sterically hindered anhydrides such as iso-butyric, pivalic, and benzoic anhydrides are carried out with phenols and alcohols in excellent yields. Acid-sensitive alcohols are acylated in excellent yields without any competitive side reactions.
- Chakraborti, Asit K.,Sharma, Lalima,Gulhane, Rajesh,Shivani
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p. 7661 - 7668
(2007/10/03)
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- Synthesis of some benzothiazepins and their antimicrobial activities
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A series of 2-[(substitutedphenyl)-4-(substitutedphenyl)]-3,3-dihydro substituted-1,5-benzothiazepin 3 has been synthesized starting from acetophenones. The compounds are characterized and screened for their antimicrobial activities.
- Shetgiri,Nayak
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p. 683 - 687
(2007/10/03)
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- Synthesis and in-vitro evaluation of platelet aggregation inhibitory activity of paeonol and its analogues
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Paeonol (1-(2-hydroxy-4-methoxyphenyl)ethanone) and a series of substituted 1-(2-hydroxyphenyl)ethanone derivatives were synthesized and screened as inhibitors of platelet aggregation. The compounds with the greatest anti-platelet potential among the series tested were 1-(2,5-dihydroxyphenyl)ethanone (65.36% inhibition at 300 μM against 5 μM ADP), paeonol(36.31%), 1-(2-hydroxy-5-methoxyphenyl)ethanone (24.47%), 1-(2-hydroxy-5-nitrophenyl) ethanone (30.40%) and 1-(5-chloro-2-hydroxy-4-methylphenyl)ethanone (24.43%).
- Akamanchi,Padmawar,Thatte,Rege,Dahanukar
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p. 323 - 329
(2007/10/03)
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