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Общее количество найденных документов : 21
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 1-10    11-21   21-21 
1.
Инвентарный номер: нет.
   
   F 94

   
    From 1,2,4-triazines towards Substituted pyridines and their cyclometalled Pt complexes [Electronic resource] / V. N. Kozhevnikov, M. M. Ustinova, P. A. Slepukhin, D. N. Kozhevnikov, Amedeo Santoro, W. Dunkan // Tetrahedron Letters. - 2008. - Vol. 49, № 26. - P4096-4098 : рис. - Библиогр. : с. 4098 (28 назв.) . - ISSN 0040-4039
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: A new, efficient methodology for the synthesis of substituted thienylpyridines includes the synthesis of 3-thienyl-1,2,4-triazines using simple heterocyclisation followed by easy transformation of the triazine ring to a pyridine through an aza Diels–Alder approach. A variety of substituted pyridines can be easily achieved using cheap, commercially available reagents such as bromoacetylarenes, aroyl hydrazides, norbornadiene, and enamines in various combinations. New thienylpyridines form phosphorescent cyclometallated Pt complexes.??

\\\\Expert2\\nbo\\Tetrahedron Letters\\2008, v. 49, p.4096.pdf
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2.
Инвентарный номер: нет.
   
   F 70

   
    Fluoro-containing heterocycles: XIV. Cyclic adducts of 6-fluoro-7-azidoquinoxaline and their transformation products [Electronic resource] / N. N. Mochul`skaya, E. N. Nagibina, Yu. S. Volchenkova, L. P. Sidorova, V. N. Charushin // Russian Journal of Organic Chemistry (Translation of Zhurnal Organicheskoi Khimii). - 2005. - Vol. 41, № 11. - P1694-1701. - Библиогр. : с. 1701 (18 назв.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The possibility of a structural modification of quinoxalines through 1,3-dipolar cycloaddition of 7-azido-6-fluoroquinoxaline to norbornenes, enamines of cyclic ketones, and dimethyl acetylenedicarboxylate was demonstarated. The stability of 1,2,3-triazoline adducts was studied and the structure of the products of their molecular rearrangements was established. The cycloadduct of azide with cyclohexanone enamine undergoes azapinacolone rearrangement involving a contruction of the cycloalkane ring by one member affording amidine of cyclopentanecarboxylic acid. The triazoline adduct of the azide with dicyclopentadiene as a result of the rearrangement affords the corresponding aziridinoquinoxaline.

\\\\Expert2\\nbo\\Russian Journal of Organic Chemistry\\2005, 41 (11), 1694.pdf
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3.
Инвентарный номер: нет.
   
   A 10

   
    A versatile strategy for the synthesis of functionalized 2,2 '-bi- and 2,2 ': 6 ',2 '-terpyridines via their 1,2,4-triazine analogues [Text] / V. N. Kozhevnikov, D. N. Kozhevnikov, T. V. Nikitina, V. L. Rusinov, O. N. Chupakhin, M. Zabel, B. Konig // Journal of Organic Chemistry. - 2003. - Vol. 68, № 7. - P2882-2888
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ALDEHYDES -- OXIDATION -- SUBSTITUTION REACTIONS
Аннотация: A general synthetic route for the synthesis of functionalized bi- and terpyridines is reported. Functionalized 1,2,4-triazene 4-oxides 7 and 8 - obtained from the reaction of hydrazones 1 with pyridine aldehydes and followed by oxidation - are functionalized by introduction of a cyano group via nucleophilic aromatic substitution. The thus-obtained 5-cyano-1,2,4-triazines 9 and 10 undergo facile inverse-electron-demand Diels-Alder reactions with enamines and alkenes to yield functionalized bi- and terpyridines, respectively. The substituent at position 6 of the 1,2,4-triazene 4-oxides must be aromatic or heteroaromatic in order to allow their facile synthesis, but other substituents and reagents may vary. Each step of the synthetic route allows diversification, which makes the approach particularly useful for the facile synthesis of a large variety of functionalized bi- and terpyridines.

\\\\Expert2\\nbo\\Journal of Organic Chemistry\\2003, v.68, N 7, p.2882. Chupakhin.pdf
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4.
Инвентарный номер: нет.
   
   R 30

   
    Reaction of pentafluorobenzoylpyruvic acid with amines [Electronic resource] / V. I. Saloutin, I. T. Bazyl, Z. E. Skryabina, P. N. Kondrat'ev, O. N. Chupakhin // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 1994. - Vol. 43, № 2. - P279-282
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
CYCLIZATION -- INTRAMOLECULAR CYCLIZATION -- PRIMARY AMINES -- PENTAFLUOROBENZOYLPYRUVIC ACID
Аннотация: Reactions of pentafluorobenzoylpyruvic acid with amines afford the respective enamines. The intramolecular cyclization of the latter results in N-substituted 4-quinolone-2-carboxylic acids. Ammonia and triethylamine favor the cyclization of pentafluorobenzoylpyruvic acid to 2-carboxychromone.

\\\\Expert2\\nbo\\Russian Chemical Bulletin\\1994, 43 (2), 279.pdf
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5.
Инвентарный номер: нет.
   
   Z 99

   
    [4+2]-Cycloaddition of 3,6-bis(3,5-dimethyl-4-R-pyrazol-1-yl)-1,2,4,5-tetrazines with alkenes [Electronic resource] / G. L. Rusinov, R. I. Ishmetova, N. I. Latosh, I. N. Ganebnuikh, O. N. Chupakhin, V. A. Potemkin // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2000. - Vol. 49, № 2. - P355-362
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: A number of 1,4-dihydropyridazines and pyridazines were prepared by the Diels-Alder reaction with an inverse electron demand from cyclic heterodiene systems, 3,6-bis(3,5-dimethyl-4-R-pyrazol-1-yl)-1,2,4,5-tetrazines, and some enamines as well as from 4-vinylpyridine, butyl vinyl ether, phenylacetylene, and acrylamide. The reaction of 3,6-bis(3,5-dimethylpyrazol-1-yl)-1,2,4,5-tetrazine with styrene afforded 4,5-dihydropyridazine, which was readily oxidized by atmospheric oxygen to form the corresponding pyridazine. Electron-withdrawing substituents (Br or Cl) in the pyrazole rings accelerate [4+2]-cycloaddition. When heated, 1,4-dihydropyridazines, which were synthesized from tetrazines and enamines, eliminated amine to give pyridazines. The reactivities of tetrazines were evaluated by quantum-chemical methods.

\\\\Expert2\\nbo\\Russian Chemical Bulletin\\2000, 49 (2), 355.pdf
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6.
Инвентарный номер: нет.
   
   U 52

   
    Unexpected products in the reactions of s-tetrazine hydrazones with enamines [Text] / G. L. Rusinov, R. I. Ishmetova, I. N. Ganebnuikh, O. N. Chupakhin, G. G. Aleksandrov, I. A. Litvinov, D. B. Krivolapov // Heterocyclic communications. - 2003. - Vol. 9, № 1. - P39-44
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: For the first time in the reactions of some 1,2,4,5-tetrazine hydrazones with enamines in addition to the expected products of Carbony-Lindsey reaction the unusual addition and cyclization products at cyclic and exocyclic nitrogen atom of tetrazine ring have been isolated.

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7.
Инвентарный номер: нет.
   
   N 52

   
    New enamine ligands derived from ethyl 2-ethoxymethylidene-3-oxo-3-polyfluoroalkylpropionates and omega-phenylenediamine [Electronic resource] / Yu. S. Kudyakova, M. V. Goryaeva, Ya. V. Burgart, P. A. Slepukhin, V. I. Saloutin // Russian Chemical Bulletin (Translation of Izvestiya Akademii Nauk, Seriya Khimicheskaya). - 2010. - Vol. 59, № 8. - P1582-1593 : рис., табл. - Bibliogr. : p. 1593 (26 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
BETA-KETO ACIDS -- OMEGA-PHENYLENEDIAMINE -- ENAMINES -- LIGANDS -- COPPER(ii) COMPLEXES -- NICKEL(ii) COMPLEXES -- COBALT(ii) COMPLEXES -- ORGANOFLUORINE COMPOUNDS
Аннотация: Diethyl 2,2' [1,2-phenylenebis(aminomethylidene)]bis(3-oxo-3-polyfluoroalkylpropionates) were synthesized by the condensation of a double excess of ethyl 2-ethoxymethylidene- 3-oxo-3-polyfluoroalkylpropionates with o-phenylenediamine. The use of equimolar ratios of the starting reactants affords ethyl 2-[(2-aminophenyl)aminomethylidene]-3-oxo- 3-polyfluoroalkylpropionates from which nonsymmetric biscondensation products were synthesized by the reaction with related reactants containing different polyfluoroalkyl substituent. The copper(II), nickel(II), and cobalt(II) complexes were obtained on the basis of new ligands.

\\\\Expert2\\nbo\\Russian Chemical Bulletin\\2010, 59 (8), 1582-1593.pdf
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8.
Инвентарный номер: нет.
   
   U 62

   
    Unusual ring-chain tautomerism in bicyclo[4.2.0]octane derivatives [Text] / V. Yu. Korotaev, A. Yu. Barkov, P. A. Slepukhin, M. I. Kodess, V. Ya. Sosnovskikh // Tetrahedron Letters. - 2011. - Vol. 52, № 23. - P3029-3032 : рис.
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: A new type of ring-chain tautomerism, which consists of the reversible conversion of bicyclo[4.2.0]octane derivatives into trisubstituted enamines was found and studied by 1H NMR spectroscopy. The starting materials were prepared by the stereoselective reaction of (E)-3,3,3-trichloro-1-nitropropene with cyclohexanone enamines

\\\\Expert2\\nbo\\Tetrahedron Letters\\2011, v. 52, p. 3029.pdf
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9.
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   D 53

   
    Diastereoselective reactions of 1,1,1-trichloro(trifluoro)-3-nitrobut-2-enes with 2-morpholinoalk-1-enes [Electronic resource] / V. Yu. Korotaev, A. Yu. Barkov, P. A. Slepukhin, M. I. Kodess, V. Ya. Sosnovskikh // Mendeleev Communications. - 2011. - Vol. 21, № 2. - P112-114. - Bibliogr. : p. 114 (12 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Reactions of (E)-1,1,1-trichloro(trifluoro)-3-nitrobut-2-enes with 3,3-dimethyl-2-morpholinobutene in benzene give (4R*,6R*)-6-tert-butyl-3-methyl-6-morpholino-4-trihalomethyl-5,6-dihydro-4H-1,2-oxazine 2-oxides. In a dichloromethane solution, these cyclic nitronates undergo diastereoselective ring opening to produce nitroalkylated anti-CCl3- and syn-CF3-enamines, which are hydrolysed with dilute HCl to afford the respective anti-CCl3- and syn-CF3-g-nitroketones

\\\\Expert2\\nbo\\Mendeleev Communications\\2011, v.21, p.112.pdf
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10.
Инвентарный номер: нет.
   
   U 50

   
    Uncatalyzed reactions of alfa-(trihaloethylidene)nitroalkanes with push-pull enamines: a new type of ring-ring tautomerism in cyclobutane derivatives and the dramatic effect of the trihalomethyl group on the reaction pathway [Text] / V. Yu. Korotaev, A. Yu. Barkov, P. A. Slepukhin, M. I. Kodess, V. Ya. Sosnovskikh // Tetrahedron Letters. - 2011. - In Press, Accepted Manuscript, 30 august 2011. - P1-15. - Bibliogr. : p. 10-12 (15 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: A new type of ring-ring isomerism, which consists of the reversible transformation of cyclobutane derivatives into substituted 1,2-oxazine N-oxides was found and studied by NMR spectroscopy and X-ray diffraction analysis. The starting materials were prepared by the stereoselective reaction of ?-(trifluoroethylidene)nitroalkanes, which react with ethyl ?-morpholino- and ?-piperidinocrotonates at the more nucleophilic ?-position, whereas the reaction of ?-(trichloroethylidene)nitroalkanes proceeds at the ?-methyl group to give the corresponding linear products

\\\\Expert2\\nbo\\Tetrahedron Letters\\2011, In Press, Acc. Man. 30 aug.pdf
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