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1.
A. K. Fogla Vandana Ankodia Praveen Kumar Sharma M. Kumar 《Research on Chemical Intermediates》2009,35(1):35-41
N-bridged heterocycles, 2-methyl-4H-pyrimido[2,1-b]benzothiazol-4-ones, have been synthesized in quantitative yield by the reaction of 2-aminobenzothiazoles with ethylacetoacetate
in the presence of polyphosphoric acid involving dehydrative condensation followed by cyclization. The possibility of the
formation of 4-methyl-2H-pyrimido[2,1-b]benzothiazol-2-ones has been excluded on the basis of spectral studies. 相似文献
2.
M. Madesclaire P. Coudert V. Gaumet V. P. Zaitsev Yu. V. Zaitseva 《Chemistry of Heterocyclic Compounds》2006,42(5):665-670
We have synthesized a series of (1R,2R,4S,5S,8S)-2,8-diaryl-4-(4-nitrophenyl)-1-aza-3,7-dioxabicyclo[3.3.0]octanes as a result
of reaction of (1S,2S)-2-amino-1-(4-nitrophenyl)-1,3-propanediol with aromatic aldehydes. The structure of the compounds obtained
was established on the basis of 1H NMR data.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 757–763, May, 2006. 相似文献
3.
Complexes of lanthanide perchlorates with 4-cyano pyridine-1-oxide, 4-chloro 2-picoline-1-oxide and 4-dimethyl-amino 2-picoline-1-oxide
have been isolated for the first time and characterized by analysis, conductance, infrared, NMR and electronic spectra. The
complexes of 4-cyano pyridine-1-oxides have the composition Ln(CyPO)6(ClO4)3. 2H2O (Ln=La, Sm, Dy and Ho); Ln(CyPO)7 (ClO4)3. 2H2O (Ln=Pr, Nd, Er and Yb); and Ln(CyPO)5 (ClO4)3. 2H2O (Ln=Gd and Tb). The complexes of 4-chloro 2-picoline-1-oxide analyse for the formulae Ln(CpicO)6 (ClO4)3 (Ln=La, Pr, Nd and Ho); and Ln (CpicO)5 (ClO4)3 (Ln=Er and Yb), and those of 4-dimethylamino 2-picoline-1-oxide for Ln(DMPicO)6 (ClO4)3 (Ln=La and Nd); Ln(DMPicO)7 (ClO4)3 (Ln=Gd, Er and Yb); and Ln(DMPicO)8 (ClO4)3 (Ln=Dy and Ho). 相似文献
4.
M. Madesclaire V. P. Zaitsev J. V. Zaitseva S. Kh. Sharipova 《Chemistry of Heterocyclic Compounds》2007,43(10):1325-1332
A synthesis is reported for (4R,5R)-and (4S,5S)-4-hydroxymethyl-5-(4-nitrophenyl)oxazolidin-2-ones and (1′R,4R)-and (1′S,4S)-4-[hydroxy(4-nitrophenyl)methyl]oxazolidin-2-ones from (1R,2R)-and (1S,2S)-2-amino-1-(4-nitrophenyl)-1,3-propanediols. The effect of the experimental conditions on the formation of these compounds
was studied.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1562–1570, October, 2007. 相似文献
5.
M. Madesclaire P. Coudert V. Goumet V. P. Zaitsev J. V. Zaitseva 《Chemistry of Heterocyclic Compounds》2006,42(6):813-817
The configuration of the asymmetric atoms in the molecule of (1R,2R,4S,5S,8S)-2,8-bis(4-chlorophenyl)-4-(4-nitrophenyl)-1-aza-3,7-dioxabicyclo[3,3,0]octane
has been determined using X-ray analysis.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 930-934, June, 2006. 相似文献
6.
I. V. Ukrainets I. A. Tugaibei N. L. Bereznyakova V. N. Kravchenko A. V. Turov 《Chemistry of Heterocyclic Compounds》2008,44(5):565-575
Alkyl-, arylalkyl-, and arylamides of 2-hydroxy-4-oxo-4H-pyrido[1,2-a]pyrimidine-3-carboxylic acid were prepared with a view
to establishing a structure-biological activity relationship. A comparative analysis has been made of their diuretic properties
and those of the structurally similar 4-hydroxy-2-oxo-1,2-dihydroquinoline-3-carboxamides.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 718–729, May, 2008. 相似文献
7.
中位-四(对烷氧苯基 )卟啉 Co2+、Cu2+、Zn2+、Pb2+配合物的合成与表征 总被引:1,自引:0,他引:1
Synthesis of fourteen new complexes of meso-tetrakis(4-alkoxyphenyl) porphyrins with Co2+, Cu2+, Zn2+, Pb2+ were presented in this paper.Meso-tetrakis (4-alkoxyphenyl) porphyrins were prepared by condensation of 4-alkoxybenzaldehydes with pyrrole, then treated with corresponding metallic acetate to produce mentioned complexes, IR, UV, 1H NMR, MS and elementary analysis were explored to confirm the structures of all theses new complexes.Characteristic spectrometric data of IR, UV, 1H NMR related to these complexes have been systematically summarized.Ten of the fourteen complexes were found to exhibit liquid crystal properties. 相似文献
8.
利用三有机锡氢氧化物和手性配体(4R)-3-[[(2S)-5-氧-2-吡咯烷基]羰基]-4-噻唑烷甲酸(HL)反应合成了3个三有机锡(4R)-3-[[(2S)-5-氧-2-吡咯烷基]羰基]-4-噻唑烷甲酸酯R3SnL[1,R=c-C6H11(a),C6H5(b),C6H5C(CH3)2CH2(c)],通过元素分析、IR、1H NMR和X-射线单晶衍射表征了其结构。化合物1a属正交晶系,P212121空间群;化合物1b属单斜晶系,P21空间群。二者均为由羧基氧和内酰胺羰基氧桥联配位形成的右螺旋链状有机锡配位聚合物,锡原子具有五配位[SnC3O2]畸变三角双锥构型。化合物1a和1b对体外2种人癌细胞Colo205和Bcap37增殖均有强的抑制作用,其活性为1b >1a。 相似文献
9.
R. Weis U. di Vora W. Seebacher K. Schweiger 《Monatshefte für Chemie / Chemical Monthly》1995,126(12):1367-1374
Summary 6-Phenylimino-3,6-dihydro-2H-thiopyran-4-amines (1) were converted to 1-phenyl-5,6-dihydropyridine-2(1H)-thiones (3). Those were akylated and hydrolyzed, thus yielding 6-methylthio-1-phenyl-2,3-dihydro-4(1H)-pyridinones (5). Finally, the methylthio group was removed withRaney nickel giving the title compounds6. The relative configurations of the formed diastereoisomeric dihydropyridinones have been investigated by NOE measurements.
Umwandlung von 6-Phenylimino-2H-thiopyran-4-aminen zu 1-Phenyl-2,3-dihydro-4(1H)-pyridinonen
Zusammenfassung 6-Phenylimino-3,6-dihydro-2H-thiopyran-4-amine (1) wurden in 1-Phenyl-5,6-dihydropyridin-2(1H)-thione (3) umgewandelt. Diese wurden alkyliert und zu 6-Methylthio-1-phenyl-2,3-dihydro-4(1H)-pyridinonen (5) hydrolysiert. Zuletzt gelangte man durch selektives Entfernen der Methylthiogruppe mitRaney-Nickel zu den Titelverbindungen6. Die relativen Konfigurationen der gebildeten diastereomeren Dihydropyridinone wurden durch NOE-Messungen aufgeklärt.相似文献
10.
V. L. Gein N. N. Kasimova L. I. Varkentin G. A. Stashina 《Chemistry of Heterocyclic Compounds》2005,41(8):1041-1044
The reaction of substituted methyl aroylpyruvates with 1-aminomethyl-1,2,3,4-tetrahydroisoquinoline dihydrochloride in the
presence of AcOH gives 3-aroylmethylene-1,6,7,11b-tetrahydro-2H-pyrazino[2,1-a]isoquinolin-4-ones whose structures have been
confirmed by IR, 1H NMR, and mass spectrometry.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1218–1221, August, 2005. 相似文献
11.
以间二氯苯与氯乙酰氯反应,生成ω-氯代-2,4-二氯苯乙酮(1),再使之分别与3-烷基/芳基-4-氨基-5-巯基-1,2,4-三唑(2a~2l)反应,合成了12种新的3-烷基/芳基-6-(2',4'-二氯苯基)-7H-1,2,4-三唑并[3,4-b]1,3,4-噻二嗪(4a~4l)。利用EA,IR,^1HNMR确定了其结构,并提出该反应的可能机制。 相似文献
12.
《Analytical letters》2012,45(12):2345-2357
Abstract An extraction-spectrophotometric method for the determination of trace amounts of iron based on its extraction into chloroform with 2-(4, 5-dimethyl-2-thiazolylazo)-4, 6-dimethylphenol has been developed, which allows the determination of 5–28 μg Fe (?773 = 1.38×104 1. mol?1. cm?1). The use of second order analogue derivative spectrophotometry allows the determination of down to 0.2–5 μg, Fe. The methods are quite selective and have been applied to the determination of iron in mineral waters. 相似文献
13.
V. A. Chebanov S. M. Desenko S. A. Kuzmenko V. A. Borovskoy V. I. Musatov Yu. V. Sadchikova 《Russian Chemical Bulletin》2004,53(12):2845-2849
The reactions of 3-amino-1,2,4-triazole, 5-aminotetrazole, and 2-aminobenzimidazole with 2-aryl-4-arylidene-4H-oxazol-5-ones (azlactones) were studied. The electron-releasing properties of the azole ring were demonstrated to influence the reaction pathway of azlactones with aminoazoles. The structures of the resulting compounds were established by 1H and 13C NMR spectroscopy using spin-spin decoupling and the nuclear Overhauser effect.__________Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2730–2733, December, 2004. 相似文献
14.
N. V. Gorbulenko T. M. Tkachuk T. V. Shokol V. V. Semeniuchenko A. V. Turov V. P. Khilya 《Chemistry of Heterocyclic Compounds》2007,43(5):569-575
The interaction has been studied of a series of substituted 3-hetaryl-7-hydroxychromones with amino acids and formaldehyde
(reactants ratio 1: 1: 2 respectively). In the case of glycine and Het = 3-isoxazolyl the product of aminomethylation at position
8 of the chromone was obtained, and with other Het (including Het = 4-phenyl-1,2,4-triazol-3-yl) 2-[6-alkyl-3-hetaryl-4-oxo-9,10-dihydro-4H,8H-chromeno[8,7-e][1,3]-oxazin-9-yl]acetic
acids were formed. With β-alanine and Het = 4-phenyl-1,2,4-triazol-3-yl the corresponding β-substituted propionic acid was
synthesized, but proline did not participate in the reaction, leading to bis(6-ethyl-3-hetaryl-7-hydroxychromon-8-yl)methane.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 683–689, May, 2007. 相似文献
15.
A method has been developed for the synthesis of 4-amino-substituted 7-benzyl-2-morpholin-4-yl-5,6,7,8-tetrahydropyrido[3,4-d]pyrimidines
by condensation of ethyl 1-benzyl-3-oxopiperidine-4-carboxylate with morpholine-4-carboxamidine and subsequent reaction of
the 7-benzyl-2-morpholin-4-yl-5,6,7,8-tetrahydro-3H-pyrido[3,4-d]pyrimidin-4-one with trifluoromethanesulfonic anhydride and
secondary amines.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 5, pp. 762–768, May, 2007. 相似文献
16.
M. Madesclaire P. Coudert V. P. Zaitsev J. V. Zaitseva 《Chemistry of Heterocyclic Compounds》2006,42(4):506-511
A series of isomeric 2-oxazolidinones has been synthesized from (1S, 2S)-2-amino-1-(4-nitrophenyl)-1,3-propanediol.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 579–584, April, 2006. 相似文献
17.
2-Polyfluoroalkylchromene-4(4H)-thiones, synthesized from 2-polyfluoroalkylchromones and P2S5, react with aniline, phenylhydrazines, and hydroxylamine at the C(4) atom and afford corresponding anils, phenylhydrazones, and oximes of chromones. On heating in alcohol in the presence of concentrated HCl, chromone phenylhydrazones and oximes undergo ring closure to form 3-(2-hydroxyaryl)-1-phenyl-5-polyfluoroalkylpyrazoles and 5-hydroxy-3-(2-hydroxyaryl)-5-polyfluoroalkyl-Δ2-isoxazolines.__________Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 2188–2195, October, 2004. 相似文献
18.
Raman and infrared spectra of polycrystalline6Li2C2O4 and7Li2C2O4 have been investigated in the wavenumber region from 1,800 to 40 cm–1. The internal C2O4
–2 vibrations have been studied on the basis of a D2h molecular structure and the correlation field splittings have been found to be about 40 cm–1 for the stretching modes and about 15 cm–1 for the bending modes. The external vibrations of the Li+ and C2O4
–2 sites have been discussed by considering the results of the factor group analysis and the6Li/7Li isotope effect on the normal vibrations.
Raman- und Infrarot-Spektren von6Li2C2O4 und7Li2C2O4
Zusammenfassung Es wurdenRaman- und IR-Spektren von polykristallinem6Li2C2O4 und7Li2C2O4 im Bereich der Wellenzahlen von 1800 bis 40 cm–1 untersucht. Die internen Schwingungen wurden auf der Basis einer D2h Molekülstruktur analysiert. Für die Streckschwingungen wurde eine Korrelationsaufspaltung von etwa 40 cm–1 gefunden, für die Deformationsschwingungen etwa 15 cm–1. Die Diskussion der externen Schwingungen von Li+ und C2O4 –2 erfolgte unter Berücksichtigung der Resultate der Faktorgruppenanalyse und des6Li/7Li Isotopeneffekts auf die Normalschwingungen.相似文献
19.
I. V. Ukrainets I. A. Tugaibei A. A. Tkach V. B. Rybakov A. V. Turov 《Chemistry of Heterocyclic Compounds》2008,44(3):316-323
Condensation of aminopyrazine with triethyl methanetricarboxylate gave ethyl 2-hydroxy-4-oxo-4H-pyrazino[1,2-a]pyrimidine-3-carboxylate.
According to X-ray analytical data the compound exists in the 2-hydroxy-4-oxo form in the crystal.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 411–419, March, 2008. 相似文献
20.
M. Petrova E. Liepinsh P. Pastors M. Fleisher V. Kampars 《Chemistry of Heterocyclic Compounds》2008,44(7):820-827
2-Benzylidene-4-aza-1,3-indanediones have been synthesized and their structures have been investigated by NMR spectroscopy
and quantum chemistry in the AM1 approximation. It was established that rotation about the exocyclic C(2)=C(10) formal double
bond occurs in chloroform solutions of these compounds. The energy characteristics of this process have been determined experimentally
and estimated theoretically.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 7, pp. 1024–1032, July, 2008. 相似文献