- 4-Aryl-2-Imino-1,3-Dithiolanes from the Room Temperature Coupling of Sodium Dithiocarbamates with Sulfonium Salts
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A series of 4-aryl-2-imino-1,3-dithiolanes was synthesized by means of a straightforward strategy starting from readily available precursors: reactions of dithiocarbamates and arylsulfonium salts, at room temperature in water/CH2Cl2 as biphasic medium, afforded the five-membered cyclic products in good yields. The reaction mechanism was investigated by DFT calculations.
- Bresciani, Giulio,Marchetti, Fabio,Ciancaleoni, Gianluca,Pampaloni, Guido
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p. 1615 - 1622
(2021/03/03)
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- Amine-carbon disulfide promoted synthesis of novel benzo[e][1,3]thiazepin-5(1H)-one derivatives
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In this paper, a simple method is introduced for the synthesis of novel 4-substituted-3-thioxo-3,4-dihydrobenzo[e][1,3]thiazepin-5(1H)-one derivatives. The synthesis is based on a two-step reaction of 2-methylbenzoic acid, an amine, and carbon disulfide. In the first step, 2-methylbenzoic acid reacts with sulfuric acid in ethanol, followed by the reaction with N-bromosuccinimide to produce ethyl 2-(bromomethyl)benzoate. Amine and carbon disulfide react in a separate flask in basic medium to give carbamodithioate salt. Carbamodithioate and ethyl 2-(bromomethyl)benzoate react together in dimethylformamide to produce the desired 4-substituted-3-thioxo-3,4-dihydrobenzo[e][1,3]thiazepin-5(1H)-one derivatives. The method is simple and fast and is applicable to a wide variety of substrates and gives the desired products in high isolated yields.
- Asgari, Mohammad Sadegh,Bahadorikhalili, Saeed,Asadi, Mehdi,Rashidi Ranjbar, Parviz,Larijani, Bagher,Rahimi, Rahmatollah,Mahdavi, Mohammad
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p. 413 - 418
(2019/12/24)
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- Design, Synthesis, Molecular Docking, and Cholinesterase Inhibitory Potential of Phthalimide-Dithiocarbamate Hybrids as New Agents for Treatment of Alzheimer's Disease
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A novel series of phthalimide-dithiocarbamate hybrids was synthesized and evaluated for in vitro inhibitory potentials against acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE). The anti-cholinesterase results indicated that among the synthesized compounds, the compounds 7g and 7h showed the most potent anti-AChE and anti-BuChE activities, respectively. Molecular docking and dynamic studies of the compounds 7g and 7h, respectively, in the active site of AChE and BuChE revealed that these compounds as well interacted with studied cholinesterases. These compounds also possessed drug-like properties and were able to cross the BBB.
- Asadi, Mehdi,Ebrahimi, Mostafa,Mohammadi-Khanaposhtani, Maryam,Azizian, Homa,Sepehri, Saghi,Nadri, Hamid,Biglar, Mahmood,Amanlou, Massoud,Larijani, Bagher,Mirzazadeh, Roghieh,Edraki, Najmeh,Mahdavi, Mohammad
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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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- Synthesis, characterization and biodistribution of a (99m)Tc nitrido complex as a potential brain perfusion imaging agent
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The bis(N-cyclohexyl-dithiocarbamato) nitrido technetium-99m complex [(99m)TcN(CHDTC)2] (CHDTC:N-cyclohexyl dithiocarbamato) has been synthesized through a ligand-exchange reaction. The two-step procedure involved the initial reaction of (99m)TcO4- with succinic dihydrazide (SDH) in the presence of stannous chloride as reducing agent and propylenediamine tetraacetic acid (PDTA) as complexant, followed by the addition of sodium N-cyclohexyl dithiocarbamate dihydrate. The radiochemical purity of the complex was over 90% by thin layer chromatography. It was stable over 6 h at room temperature. Its partition coefficient indicated that it was a good lipophilic complex. Biodistribution in mice demonstrated that the complex accumulated in brain with high uptake and good retention. The brain uptake (ID%/g) was 2.91, 5.88 and 5.91 at 5, 30 and 60 min post-injection respectively. The ratio of brain/blood in mice was high, 2.10 at 1 hr post-injection. The results for the complex suggested that it could be a potential brain perfusion imaging agent.
- Zhang, Junbo,Wang, Xuebin,Lu, Gongxu,Tang, Zhigang
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p. 693 - 700
(2007/10/03)
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- Process for production of isothiocyanates
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Isothiocyanates are formed by oxidizing, with gaseous oxygen or air, in the presence of a metal oxidation catalyst a dithiocarbamate with appropriate control of the pH of the reaction medium to suppress the formation of by-products. Optionally a quaternary ammonium halide catalyst can be used to increase product yield.
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