- Macahydantoins A and B, two new thiohydantoin derivatives from Maca (Lepidium meyenii): Structural elucidation and concise synthesis of macahydantoin A
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Macahydantoins A (1) and B (2), two new thiohydantoin derivatives with an unprecedented skeleton, were isolated from maca (Lepidium meyenii). Their structures and absolute configurations were fully established by extensive spectroscopic and computational methods. The totally chemical synthesis of macahydantoin A was achieved via benzylamine and methyl piperidine-3-carboxylate hydrochloride through nucleophilic addition and intramolecular dehydration condensation.
- Yu, Mu-Yuan,Qin, Xu-Jie,Shao, Li-Dong,Peng, Xing-Rong,Li, Lei,Yang, Han,Qiu, Ming-Hua
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- Synthesis, crystal structure, molecular docking studies and bio-evaluation of some N4-benzyl-substituted isatin-3-thiosemicarbazones as urease and glycation inhibitors
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Fifteen N4-benzyl-substituted isatin-3-thiosemicarbazones 5a-o were synthesized and evaluated for their urease and glycation inhibitory potential. Lemna aequinocitalis growth and Artemia salina assays were also done to determine their phytotoxi
- Pervez, Humayun,Khan, Nazia,Iqbal, Jamshed,Zaib, Sumera,Yaqub, Muhammad,Tahir, Muhammad Nawaz,Naseer, Muhammad Moazzam
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- Synthesis and in vitro bio-activity evaluation of N4-benzyl substituted 5-chloroisatin- 3-thiosemicarbazones as urease and glycation inhibitors
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A series of fifteen N4-benzyl substituted 5-chloroisatin-3-thiosemicarbazones 5a-o were synthesized and screened mainly for their antiurease and antiglycation effects. Lemna aequinocitalis growth and Artemia salina assays were carried out to de
- Pervez, Humayun,Khan, Nazia,Iqbal, Jamshed,Zaib, Sumera,Yaqub, Muhammad,Naseer, Muhammad Moazzam
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p. 108 - 118
(2018/03/29)
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- Synthesis, X-ray molecular structure, biological evaluation and molecular docking studies of some N4-benzyl substituted 5-nitroisatin-3-thiosemicarbazones
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A series of fifteen N4-benzyl substituted 5-nitroisatin-3-thiosemicarbazones 5a–o was synthesized and evaluated for urease inhibitory, phytotoxic and cytotoxic influences. All the compounds proved to be highly potent inhibitors of the enzyme, s
- Pervez, Humayun,Khan, Nazia,Zaib, Sumera,Yaqub, Muhammad,Naseer, Muhammad Moazzam,Tahir, Muhammad Nawaz,Iqbal, Jamshed
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p. 1022 - 1029
(2017/02/05)
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- SURFUR-CONTAINING ALKALOIDS WITH ANTI-INFLAMMATORY ACTIVITY AND METHOD OF SYNTHESIS
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The extract from Bretschneidera sinensis, surfur-containing alkaloids disclosed in the present aspects have characterized by presented pharmaceutics, cosmetics and foods having functions to improve anti-inflammatory activity.
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Paragraph 0059; 0060
(2017/05/16)
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- Antimicrobial activities of some synthesized 1-(3-(2-methylphenyl)-4-Oxo-3H-quinazolin-2-yl-4-(substituted)thiosemicarbazide derivatives
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The substituted thiosemicarbazide moiety was placed at the C-2 position and 2-methylphenyl group at N-3 position of quinazoline ring and obtained compounds were tested for their antitubercular activities and antibacterial activities against selected gram-positive and gram-negative bacteria. The target compounds 1-(3-(2-methylphenyl)-4-oxo-3H-quinazolin-2-yl)-4-(substituted) thiosemicarbazides were obtained by the reaction of 2-hydrazino-3-(2-methylphenyl) quinazolin-4(3H)-one with different dithiocarbamic acid methyl ester derivatives. All synthesized compounds were also screened for their antimicrobial activity against selective gram-positive and gram-negative bacteria by agar dilution method. Among the series, 1-[3-(2-methylphenyl)-4-oxo-3H-quinazolin-2-yl]-4-[4-chlorophenyl]-thiosemicarbazide exhibited the most potent activity against S. typhi, E. coli, and B. subtilis, while 1-[3-(2-methylphenyl)-4-oxo-3H-quinazolin-2-yl]-4-[4-nitrophenyl]-thiosemicarbazide was the most potent against E. coli, B. subtilis, P. aeruginosa, S. typhi, and S. flexneri. These two compounds exhibited the antitubercular activity at the minimum concentration (3 μg/mL) that offered potential for further optimization and development of new antitubercular agents. The obtained results demonstrated promising antimicrobial and antitubercular activities of the synthesized quinazoline compounds which could be used as new scaffolds for improving their antimicrobial activity.
- Alagarsamy,Anjana,Sulthana,Parthiban,Solomon, V. Raja
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p. 332 - 339
(2016/07/06)
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- Design, synthesis and antimicrobial activities of 1-(4-oxo-3-(4-fluorophenyl)-3H-quinazolin-2-yl)-4-(substituted) thiosemicarbazide derivatives
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A new series of 1-(4-oxo-3-(4-fluorophenyl)-3H-quinazolin-2-yl)-4-(substituted) thiosemicarbazides (AR1-AR10) were obtained by the reaction of 2-hydrazino-3-(4-fluorophenyl) quinazolin-4(3H)-one (6) with different dithiocarbamic acid methyl ester derivatives. The key intermediate 3-(4-fluorophenyl)-2-thioxo-2,3-dihydro-1H-quinazolin-4-one (4) was obtained by reacting 4-fluoroaniline (1) with carbon disulphide and sodium hydroxide in dimethyl sulphoxide to give sodium dithiocarbamate, which was methylated with dimethyl sulfate to yield the dithiocarbamic acid methyl ester (2) and condensed with methyl anthranilate (3) in ethanol yielded the desired compound (4) via the thiourea intermediate. The SH group of compound (4) was methylated for the favorable nucleophilic displacement reaction with hydrazine hydrate, which afford 2-hydrazino-3-(4-fluorophenyl)-3H-quinazolin-4-one (6). All synthesized compounds (AR1-AR10) were also screened for their antimicrobial activity against selective gram positive and gram negative by agar dilution method. In the present study compounds AR8 and AR9 were emerged as the most active compounds of the series.
- Alagarsamy,Appani, Ramgopal,Sulthana,Narendar,Solomon, V. Raja
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p. 2856 - 2860
(2016/10/12)
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- Syntheses and antimicrobial activities of 1-(3-benzyl-4-oxo-3,4-dihydroquinazolin-2-yl)-4-(substituted) thiosemicarbazide derivatives
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A series of 1-(3-benzyl-4-oxo-3,4-dihydroquinazolin-2-yl)-4- (substituted) thiosemicarbazides (AS1-AS10) were obtained by the reaction of 3-benzyl-2-hydrazino-3H-quinazolin-4-one (6) with different dithiocarbamic acid methyl ester derivatives. The key intermediate, 3-benzyl-2-thioxo-2,3- dihydro-1H-quinazolin-4-one (4), was obtained by the reaction of benzyl amine (1) with carbon disulphide and sodium hydroxide in dimethyl sulphoxide to give sodium dithiocarbamate, which was methylated with dimethyl sulphate to yield the dithiocarbamic acid methyl ester 2 and condensation with methyl anthranilate (3) in ethanol yielded the desired compound (4) via the thiourea intermediate. The SH group of compound (4) was methylated in the favourable nucleophilic displacement reaction with hydrazine hydrate, which afforded 3-benzyl-2-hydrazino-3H-quinazolin-4-one (6). The IR, and 1H- and 13C-NMR spectra of these compounds showed the presence of peaks due to thiosemicarbazides, carbonyl (C=O), NH and aryl groups. The molecular ion peaks of the quinazolin-4-one moiety (m/z 144) were observed in all the mass spectra of the compounds AS1-AS10. Elemental (C, H, N) analysis satisfactorily confirmed purity and elemental composition of the synthesized compounds. All the synthesized compounds were screened for their antimicrobial activity against selective gram positive and gram negative bacteria by agar dilution method. In the present study, compounds AS8 and AS9 emerged as the most active compounds of the series.
- Alagarsamy, Veerachamy,Solomon, Viswas Raja,Krishnamoorthy,Sulthana,Narendar
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p. 1471 - 1479
(2016/02/18)
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- An efficient one-pot multicomponent synthesis of 2,3-dihydro-3-alkyl/aryl- 2-thioxoquinazolin-4(1 H)-ones under solvent-free conditions
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A series of 2,3-dihydro-3-alkyl/aryl-2-thioxoquinazolin-4(1H)-one is prepared by one-pot multicomponent reaction of anthranilic acid, S,S-dimethyl trithiocarbonate and aliphatic/aromatic amine under solvent-free conditions. Georg Thieme Verlag Stuttgart New York.
- Devi, Nepram Sushuma,Singh, Sarangthem Joychandra,Singh, Okram Mukherjee
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p. 2111 - 2115
(2012/11/07)
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- An efficient use of microwave-superoxide combination for the synthesis of organic carbamates and dithiocarbamates
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The present report demonstrates an efficient use of microwave- tetraethylammonium superoxide combination under non-aqueous conditions to bring about a mild and safe carbamation/thiocarbamation of amines, using carbon dioxide/carbon disulfide and methyl iodide.
- Singh, Satish Kumar,Verma, Manjusha,Singh, Krishna Nand
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experimental part
p. 1545 - 1548
(2009/04/07)
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- Novel IDO inhibitors and methods of use thereof
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Novel indoleamine 2,3-dioxygenase (IDO) inhibitors, compositions comprising the same, and methods of use thereof are disclosed.
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Page/Page column Sheet 2/7; 8
(2010/11/27)
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- Synthesis and pharmacological investigation of novel 4-benzyl-1-substituted-4H-[1,2,4]triazolo[4,3-a]quinazolin-5-ones as new class of H1-antihistaminic agents
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A series of novel 1-substituted-4-benzyl-4H-[1,2,4]triazolo[4,3-a]quinazolin-5-ones were synthesized by the cyclization of 2-hydrazino-3-benzyl-3H-quinazolin-4-one with various one-carbon donors. The starting material 2-hydrazino-3-benzyl-3H-quinazolin-4-one was synthesized from benzylamine by a new innovative route. When tested for their in vivo H1-antihistaminic activity on guinea pigs, all the test compounds protected the animals from histamine induced bronchospasm significantly. The compound 1-methyl-4-benzyl-4H-[1,2,4]triazolo[4,3-a]quinazolin-5-one (II) emerged as the most active compound of the series and it is more potent (percent protection 76%) when compared to the reference standard chlorpheniramine maleate (percent protection 71%). Compound II showed negligible sedation (7%) when compared to chlorpheniramine maleate (30%). Hence it could serve as prototype molecule for further development as a new class of H1-antihistamines.
- Alagarsamy,Solomon,Murugan
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p. 4009 - 4015
(2008/03/11)
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- 1-(Methyldithiocarbonyl)imidazole as thiocarbonyl transfer reagent: A facile one-pot three-component synthesis of 3,5- and 1,3,5-substituted-2- thiohydantoins
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An efficient three-component one-pot synthesis of 3,5-and 1,3,5-substituted 2-thiohydantoins employing easily accessible amino acid esters, primary amines and 1-(methyldithiocarbonyl)imidazole as thiocarbonyl transfer reagent has been reported. Georg Thieme Verlag Stuttgart.
- Sundaram,Venkatesh,Ila,Junjappa
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p. 251 - 254
(2007/10/03)
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- Structure-activity study of brassinin derivatives as indoleamine 2,3-dioxygenase inhibitors
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A screen of indole-based structures revealed the natural product brassinin to be a moderate inhibitor of indoleamine 2,3-dioxygenase (IDO), a new cancer immunosuppression target. A structure-activity study was undertaken to determine which elements of the brassinin structure could be modified to enhance potency. Three important discoveries have been made, which will impact future IDO inhibitor development: (i) The dithiocarbamate portion of the brassinin lead is a crucial moiety, which may be binding to the heme iron of IDO; (ii) an indole ring is not necessary for IDO inhibition; and (iii) substitution of the S-methyl group of brassinin with large aromatic groups provides inhibitors that are three times more potent in vitro than the most commonly used IDO inhibitor, 1-methyl-tryptophan.
- Gaspari, Paul,Banerjee, Tinku,Malachowski, William P.,Muller, Alexander J.,Prendergast, George C.,DuHadaway, James,Bennett, Shauna,Donovan, Ashley M.
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p. 684 - 692
(2007/10/03)
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- 1-(Methyldithiocarbonyl)imidazole: A useful thiocarbonyl transfer reagent for synthesis of substituted thioureas
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1-(Methyldithiocarbonyl)imidazole 1 and its N-methyl quaternary salt 2 have been shown to be efficient methyldithiocarbonyl and thiocarbonyl transfer reagents for the synthesis of dithiocarbamates, symmetrical and unsymmetrical mono-, di- and tri-substituted thioureas in high yields under mild and simple non-hazardous reaction conditions. (C) 2000 Elsevier Science Ltd.
- Mohanta, Pramod K.,Dhar, Sanchita,Samal,Ila,Junjappa
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p. 629 - 637
(2007/10/03)
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- Biosynthesis of cruciferous phytoalexins
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We report the results of biosynthetic studies on the sulfur-containing indole phytoalexins, antimicrobial compounds produced by plants after exposure to microorganisms. Feeding experiments with UV-irradiated sliced turnip root (Brassica campestris ssp. ra
- Monde, Kenji,Takasugi, Mitsuo,Ohnishi, Toshiyuki
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p. 6650 - 6657
(2007/10/02)
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