共查询到20条相似文献,搜索用时 46 毫秒
1.
D. Ashok M. Sarasija D. Shravani B. Vijayalaxmi K. Sudershan 《Russian Journal of General Chemistry》2016,86(4):930-933
A series of new (E)-1-(4-chloro-7-hydroxy-2-aryl-2H-chromen-6-yl)-3-arylprop-2-en-1-ones (2a–2f) have been synthesized by selective mono cyclization of 4,6-dicinnamoyl resorcinols (1a–1f) using Vilsmeier–Haack reagent under conventional heating and microwave irradiation. The structures of the synthesized compounds have been elucidated by elemental analysis, IR, 1H NMR, 13C NMR and Mass spectral data. The synthesized compounds were tested in vitro for antimicrobial activity. 相似文献
2.
A series of new (E)-1-{2-[(1-benzyl-1H-1,2,3-triazol-4-yl)methoxy]phenyl}-3-(3-aryl-1-phenyl-1H-pyrazol-4-yl)prop-2-en-1-ones (3a–3i) has been synthesized via copper-catalyzed 1,3-dipolar azide-alkyne cycloaddition reaction (CuAAC) of benzyl azide with substituted (E)-3-(3-aryl-1-phenyl-1H-pyrazol-4-yl)-1-[2-(prop-2-ynyloxy)phenyl]prop-2-en-1-ones (2a–2i). The synthesized compounds have been characterized by their IR, lH, 13C NMR spectra, and mass spectroscopy data. All the compounds have been screened for antimicrobial activity. 相似文献
3.
Vad. V. Negrebetsky E. P. Kramarova D. E. Arkhipov A. A. Korlyukov A. G. Shipov Yu. I. Baukov 《Russian Chemical Bulletin》2015,64(8):1808-1813
Bis[(2,2-dimethyl-4-oxo-2H-benzo[e][1,3]oxazin-3(4H)-yl)methyl]dichlorosilane (1) and -germane (2) were synthesized by the reaction of 2,2-dimethyl-3-(trimethylsilyl)-2H-benzo[e][1,3]oxazin-3(4H)-one with bis(chloromethyl)dichlorosilane and -germane, respectively, taken in a ratio of 2 : 1. The structures of these compounds were determined and their stereodynamic behavior in solution was studied by multinuclear (1H, 13C, and 29Si) and twodimensional (1H, 13C COSY, HETCOR) NMR spectroscopy. The 29Si NMR spectroscopic study of a solution of complex 1 provides evidence that the silicon atom in this complex is pentacoordinate. The X-ray diffraction study showed that the germanium atom in complex 2 in the solid state is hexacoordinate. The permutation isomerization in the coordination units of complexes 1 and 2 was found and investigated by dynamic 1H NMR spectroscopy. Different mechanisms of stereodynamic transformations are suggested and discussed. 相似文献
4.
A series of new functionalized 2-benzoylamino-5-hetaryl-1,3,4-oxadiazoles were efficiently synthesized via the reaction of the versatile key intermediates, 2-benzoylamino-5-cyanomethyl-1,3,4-oxadiazole (1) and N-(5-(5-amino-3-phenylamino)-1H-pyrazol-4-yl)-1,3,4-oxadiazol-2-yl)-benzamide (13), with some appropriate electrophilic reagents. The structures of the newly synthesized compounds were established on the basis of elemental analyses, spectral data, and by alternative synthesis wherever possible. The mechanisms of the studied reactions are discussed. Also, we evaluate the antioxidant activity of some representative examples of the newly prepared compounds. Among the synthesized compounds, 2-benzoylamino-5-cyanomethyl-1,3,4-oxadiazole (1) and N-(5-(7-methyl-5-oxo-2-(phenylamino)-4,5-dihydropyrazolo[1,5-a]pyrimidin-3-yl)-1,3,4-oxadiazol-2-yl)benzamide (17) showed excellent antioxidant activity and exhibited high protection against DNA damage induced by the Bleomycin iron complex. 相似文献
5.
A. Kishore Kumar V. Sunitha B. Shankar T. Murali Krishna Ch. Abraham Lincoln P. Jalapathi 《Russian Journal of General Chemistry》2017,87(9):2011-2020
A series of novel 9-{2-[(1H-1,2,3-triazol-4-yl)methoxy]phenyl}-3,3,6,6-tetramethyl-3,4,5,6,7,9-hexahydro-1H-xanthene-1,8(2H)-dione derivatives were synthesized by a click chemistry approach. The structures of all the newly synthesized compounds were characterized by IR, MASS, 1H and 13C NMR spectral data. The final analogues showed good to excellent antibacterial and antifungal activities in an agar well diffusion assay. Compounds 6i and 6f were the most active against all the test bacterial and fungal strains. 相似文献
6.
G. Linga Goud S. Ramesh D. Ashok V. Prabhakar Reddy 《Russian Journal of General Chemistry》2016,86(6):1419-1423
A new series of 1-aryl-3-(1-aryl-1H-[1,2,3]triazol-4-yl)propenones (6a–6j) was synthesized by condensation of substituted acetophenones (5a–5c) with substituted 1-aryl-1H-[1,2,3]triazole-4-carbaldehydes (4a–4d) in the presence of potassium hydroxide under conditions of grinding and microwave irradiation. All the newly synthesized compounds were characterized by the IR, NMR, and mass spectroscopic analyses and their antibacterial activity against gram-positive and gram-negative bacterial strains was evaluated. Among the compounds synthesized, better activity was exhibited by 6a, 6c, 6f, 6g, and 6i. 相似文献
7.
A series of novel {5-[4-hydroxy-3-(4-phenyl-2,3-dihydro-1H-benzo[b][1,4]diazepin-2-yl)benzyl]- benzofuran-2-yl}(phenyl)methanones (5a–5g) were prepared by the condensation of (E)-3-{5-[(2- benzoylbenzofuran-5-yl)methyl]-2-hydroxyphenyl}-1-phenylprop-2-en-1-one (chalcone) (4a) with various substituted o-phenylene diamines in the presence of oxalic acid as catalyst. The structures of all compounds were characterized by FTIR, 1H NMR, 13C NMR, and MS. The representative examples were screened in vitro for antimicrobial activity. Among all compounds 4g and 5g showed potent antibacterial activity, 4b and 5g showed good antifungal activity. The data was further compared with structure based investigations using docking studies with the crystal structure of adenosine-5'-(β,γ-imido)triphosphate (2ONJ) from Staphylococcus aureus for antibacterial activity and trypsin (1FY5) protein from Fusarium oxysporum for the antifungal activity. The score values estimated by genetic algorithm were found to have a good correlation with the experimental inhibitory potencies. 相似文献
8.
M. L. Keshtov I. O. Konstantinov M. M. Krayushkin S. A. Kuklin S. M. Masoud S. N. Osipov A. R. Khokhlov 《Doklady Chemistry》2016,468(2):202-207
Two novel quinoxalinothiadiazole-containing dibromides—4,9-dibromo-6,7-bis(9,9-didodecyl7-fluoro-9H-fluoren-2-yl)[1,2,5]thiadiazolo[3,4-g]quinoxaline (11) and 4,9-dibromo-6,7-bis(9,9-didodecyl-5,7-difluoro-9H-fluoren-2-yl)[1,2,5]thiadiazolo[3,4-g]quinoxaline (19)—have been synthesized, which are promising strong electron-accepting building blocks for preparing highly efficient narrow-bandgap D–A conjugated polymers. The composition and structure of monomers 11 and 19 have been proved by elemental analysis data, IR spectroscopy, and 1H and 13C NMR. 相似文献
9.
Muhammed Bilaal Ismail Irvin Noel Booysen Matthew Piers Akerman 《Transition Metal Chemistry》2017,42(5):405-412
The respective coordination reactions of trans-[ReOCl3(PPh3)2] with N-[(4-oxo-4H-chromen-3-yl)methylidene]thiophene-2-carbohydrazide (Hchrtc) and N-[1,3-benzothiazol-2-ylmethylidene]thiophene-2-carbohydrazide (Hbztc) afforded two novel oxorhenium(V) complexes, cis-[ReOCl2(chrtc)(PPh3)] (1) and cis-[ReOCl2(bztc)(PPh3)] (2). These metal compounds were elucidated spectroscopically and their solid-state structures determined by single-crystal X-ray diffraction. The redox properties of the metal complexes were probed using cyclic and square wave voltammetry. The DNA interaction capabilities of 1 and 2 were gauged via UV/Vis spectroscopy DNA titrations and gel electrophoresis studies. A correlation is identified between the DNA cleavage observations and the redox potentials of the metal complexes. 相似文献
10.
A. G. Al Osaimi R. S. Ali H. A. Saad M. R. El Sayed Aly 《Russian Journal of General Chemistry》2017,87(6):1246-1255
Synthesis of new fused systems of triazino[5,6-b]indole starting with preparation of 3-amino[1,2,4]-triazino[5,6-b]indole 1 by reaction of isatin with 2-aminoguanidinium carbonate in boiling acetic acid is presented [1]. Intermediate compound 1 reacted with aldehyde, ethyl chloroformate, triethyl orthoformate, and ninhydrine and gave new heterotetracyclic nitrogen systems, such as 3-(N 2-guanidinylimino)indole-2(1H)-one 2, 3-(N-ethoxycarbonylamino)-4H-[1,2,4]triazino[5,6-b]indole 3, 3-(N-ethoxymethyleneamino)-4H-[1,2,4]-triazino[5,6-b]indole 4, 3-(hydrazinothiocarbonylamino)-4H-[1,2,4]triazino[5,6-b]indole 5, respectively. N-(1,3-dioxoindene-2-ylidene)-4H-[1,2,4]triazino[5,6-b]indol-3-amine 6 was synthesized by reaction of compound 1 with aldehyde, ethyl chloroformate, triethyl orthoformate, and ninhydrine. New fused indole systems, pyrimido[2′,1′:3,4][1,2,4]triazino[5,6-b]indol-3(4H)-one 8, 9, 11, 12 and 1H-imidazo[2′,1′:3,4][1,2,4]triazino-[5,6-b]indol-2(3H)-one 10, were synthesized in the reaction of the intermediate 1 with bifunctional compounds. Structures of the products were elucidated from their elemental analysis and spectral data (IR, 1H and 13C NMR and mass spectra). Antimicrobial activity of some synthesized compounds was tested. 相似文献
11.
M. L. Keshtov S. A. Kuklin I. O. Konstantinov A. S. Peregudov A. V. Muranov A. R. Khokhlov 《Doklady Chemistry》2017,472(2):25-29
A new monomer, 2,3-bis[6-fluoro-9-(2-octyldodecyl)-9H-carbazol-3-yl]-3,3'-[5,7-di(5-bromothienyl-2)thieno[3,4-b]pyrazine, M1, based on thienopyrazine containing fluorocarbazole substituents in the pyrazine ring has been synthesized. The structure of the compound has been proved by 1H and 13C NMR and elemental analysis. The HOMO and LUMO energies for monomer M1 and its precursor 3 determined by the electrochemical method are–5.03 and–3.31 eV, as well as–5.28 and–3.36 eV, respectively. Band gap widths E g ec are 1.72 and 1.92 eV for compounds M1 and 3, respectively. The new structural fragment has rather deep energy levels of frontier molecular orbitals and a small band gap width; therefore, it is a promising building block for the synthesis of polymers for organic electronics. 相似文献
12.
N. N. Kolos L. L. Gozalishvili E. N. Sivokon’ I. V. Knyazeva 《Russian Journal of Organic Chemistry》2009,45(1):119-125
One-pot condensation of 4-hydroxycoumarin with arylglyoxals and ureas gave 4-aryl-5-(4-hydroxy-2-oxo-2H-chromen-3-yl)-1H-imidazol-2(3H)-ones. The same compounds may be obtained from aroylbis(4-hydroxy-2-oxo-2H-chromen-3-yl)methanes and urea. The reaction of 4-bromobenzaldehyde with 4-hydroxycoumarin in the presence of urea led to the formation of the corresponding Michael adduct without participation of urea. 相似文献
13.
Hala M. Aly 《Journal of the Iranian Chemical Society》2016,13(6):999-1009
A simple and convenient route was performed for the synthesis of some new heterocyclic compounds based on thieno[3,2-c]pyrazole derivative for antimicrobial evaluation. The key intermediate, 5-amino-3-methyl-1-phenyl-1H-thieno[3,2-c]pyrazole-6-carbohydrazide 3, was prepared by Gewald’s synthesis of Ethyl 5-amino-3-methyl-1-phenyl-1H-thieno[3,2-c]pyrazole-6-carboxylate 2. This intermediate reacted with various reagents to afford different fused and polyfunctional substituted. The structures of these compounds were confirmed by elemental analysis, IR, 1H NMR, 13C NMR and mass spectral data. All the new synthesized compounds were screened for various microorganisms such as Aspergillus fumigatus; Geotrichum candidum; Syncephalastrum racemosum (Fungus); Candida albicans (Yeast fungus); Staphylococcus aureus; Bacillus subtilis (as Gram-positive bacteria); Pseudomonas aeruginosa and Escherichia coli (as Gram-negative bacteria) by the disc diffusion method. In general, the novel synthesized compounds possessed moderate to high antimicrobial activity against the previously mentioned microorganisms. 相似文献
14.
Acetyl benzofurans 1a, 1b reacted with isatins 2a–2f in the presence of pyridine to give corresponding 3-[2-(1-benzofuran-2-yl)-2-oxoethyl]-3-hydroxy-1,3-dihydro-2H-indol-2-one derivatives 3a–3l. Dehydration of the latter in acidic media led to the corresponding α,β-unsaturated ketones 4a–4l. The structures of newly synthesized compounds 3a–3l and 4a–4l were established on the basis of analytical and spectral data. The synthesized compounds were screened for their antibacterial and antifungal activities. Compounds 5d, 5f, and 5h displayed excellent antimicrobial activity. The synthesized compounds were studied for docking on the enzyme, Glucosamine-6-phosphate Synthase. 相似文献
15.
Kazimieras Anusevičius Ilona Jonuškienė Birutė Sapijanskaitė Kristina Kantminienė Vytautas Mickevičius 《Research on Chemical Intermediates》2016,42(9):6975-6990
N-Substituted 7-amino-4-methyl-2H-chromen-2-ones containing one or two functionalized azole or azine moieties were synthesized. The structures of all synthesized compounds were confirmed by IR, 1H NMR, and 13C NMR spectroscopy. Some of the synthesized compounds exhibited weak antibacterial activity against Rhizobium radiobacter, Escherichia coli, and Xanthomonas campestris. 相似文献
16.
M. L. Keshtov S. A. Kuklin I. O. Konstantinov A. S. Peregudov Zhi-Yuan Xie I. E. Ostapov E. E. Makhaeva A. R. Khokhlov 《Doklady Chemistry》2018,482(2):213-219
A new carbazole-containing naphthodithiophene derivative—heteroaromatic compound 5,6- bis[9-(2-decyltetradecyl)-9H-carbazol-3-yl]naphtho[2,1-b:3,4-b']dithiophene (M1)—has been synthesized. The compound will be used by us as a weak donor structural block for fabricating narrow-bandgap D–A conjugated polymers. The composition and structure of M1 have been confirmed by elemental analysis data, IR spectroscopy, and 1H and 13C NMR. The synthesized compound has a low HOMO energy (–5.4 eV), which is favorable for a high open-circuit voltage. Monomer M1 can be used as a promising weak donor moiety in D–A conjugated polymers for solar photovoltaics. 相似文献
17.
Ravibabu Velpula Rajitha Deshineni Rajitha Gali Rajitha Bavantula 《Research on Chemical Intermediates》2016,42(3):1729-1740
A series of novel 1-thiazolyl-5-coumarin-3-yl-pyrazole derivatives (4a–l) were synthesized via one-pot multicomponent reaction of 5-substituted salicylaldehydes (1a–c), 4-hydroxy-6-methyl-2H-pyran-2-one (2) and 2-hydrazinyl-4-arylthiazoles (3a–d) in acetonitrile using a catalytic amount of piperidine under reflux conditions. This multicomponent approach has advantages such as reduced reaction time and a high product yield percentage when compared with corresponding multistep approaches. All the synthesized compounds were evaluated for their cytotoxic activity against Hep G2 (hepatocellular liver carcinoma) and MCF-7 (breast cancer) cell lines and compared with the standard drug Doxorubicin. Among all the compounds, compounds 4d against Hep G2, 4k against MCF-7 and 4e against both Hep G2 & MCF-7 showed excellent cytotoxic activity. 相似文献
18.
19.
Three coordination polymers involving transition metals, namely [Co(suc)(1,4-bib)(H2O)2]n (1), [Mn(suc)(1,4-bib)(H2O)2]n (2), [Cd(suc)(1,4-bib)]n (3) (H2suc?=?succinic acid, 1,4-bib?=?1,4-bis(1H-imidazol-4-yl)benzene), have been synthesized under solvothermal conditions. All three compounds were characterized by single-crystal X-ray diffraction, elemental analysis, FTIR, UV–Vis spectroscopy, powder X-ray diffraction and thermogravimetric analyses. Compounds 1 and 2 show 2D metal–organic layers with the point symbol of {44·62}. The 3D framework of compound 3 displays a 4-connected dia net with the point symbol of {66} topology. Magnetic susceptibility studies of compound 1 indicate weak antiferromagnetic coupling between the Co(II) centers. The adsorption experiment results show that compound 3 exhibits rapid and selective separation of congo red over methylene blue and rhodamine B. 相似文献
20.
A. Sharma S. Obrai R. Kumar A. Kaur M. S. Hundal 《Journal of Structural Chemistry》2015,56(7):1379-1389
Sterically hindered meso-tetramethyl-meso-tetraarylcalix[4]pyrroles 1-4 where aryl is p-fluorophenyl 1, p-chlorophenyl 2, and p-methylphenyl 3, 4 (configurational isomers) are synthesized and purified by the recrystallization technique. They are characterized by IR, 1H and 13C NMR, and mass spectroscopy. Configurational isomers ααββ (3) and αααα (4) of meso-tetramethyl-meso-tetramethylphenylcalix[ 4]pyrroles are assigned by the 1H NMR studies and confirmed by the X-ray diffraction analysis. The single crystal X-ray diffraction analysis reveals that the ethanol adduct of 1, the acetone adduct of 2 and 3 adopt the 1,2-conformation while the acetone-water adduct of 1 and the acetone adduct of 4 adopt partial cone and cone conformations respectively. The conformational diversity is due to non-covalent interactions among the encapsulated guest, pyrrolic NH protons, and meso- substituents. Anion binding studies (F–, Cl–, CH3COO–, HSO 4 ? ) are carried out through 1H NMR titrations; the binding constants are evaluated using the EQNMR program, displaying that they are more selective towards fluoride rather than other anions with the 1:1 stoichiometry. The configuration of compounds drastically influences the ion-recognition processes. 相似文献