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Общее количество найденных документов : 17
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 1-10    11-17 
1.
Инвентарный номер: нет.
   
   C 98


   
    Cyclization of N-alkyl azinium cations with bifunctional nucleophiles. 21. Regioisomeric 1,3,4-thiadiazino[5,6-b]quinoxalines [Electronic resource] / V. G. Baklykov, V. N. Charushin, O. N. Chupakhin, V. N. Drozd // Chemistry of Heterocyclic Compounds. - 1987. - Vol. 23, № 4. - С. 465-469. - Bibliogr. : p. 469 (9 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
THIOBENZHYDRAZIDES -- N-ALKYL-QUINOXALINIUM SALTS -- THIADIAZINOQUINOXALINES
Аннотация: Thiobenzhydrazides undergo cyclization with N-alkyl-quinoxalinium salts to give 5-alkyl-substituted 1,4,4a,5,10,10a-hexahydro-1,3,4-thiadiazino[5,6-b]quinoxalines, which undergo isomerization to 10-alkyl-substituted thiadiazinoquinoxalines when they are heated in ethanol or in the presence of acids

\\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\1987, v.23, N 4, p. 465.pdf
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2.
Инвентарный номер: нет.
   
   C 98


   
    Cyclization of N-alkylammonium cations with bifunctional nucleophiles. 17. Annelation of imidazole and 1,2,4-triazine rings with pyrazines via the reactions of thiosemicarbazides with pyrazinium salts [Electronic resource] / V. G. Baklykov, V. N. Charushin, O. N. Chupakhin, N. N. Sorokin // Chemistry of Heterocyclic Compounds. - 1985. - Vol. 21, № 7. - С. 798-804. - Bibliogr. : p.
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
1,4-DISUBSTITUTED THIOSEMICARBAZIES -- CYCLIZATION REACTIONS -- THIOSEMICARBAZIDES
Аннотация: 1- and 4-mono- as well as 1,4-disubstituted thiosemicarbazies undergo cyclization reactions upon treatment with N-alkylpyrazinium and quinoxalinium salts to give N-aminosubstituted imidazo[4,5-b]pyrazines and imidazo[4,5-b]quinoxalines, respectively. Thiosemicarbazides containing substituents in the 2-position react with N-alkylquinoxaline salts to give 1,2,4-triazino[5,6-b]quinoxalines after cyclization.

\\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\1985, v.21, N 7, p. 798.pdf
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3.
Инвентарный номер: нет.
   
   C 98


   
    Cyclization of N-alkylazinium cations with bifunctional nucleophiles. 11. Reactions of quinoxalinium salts with thioamides — Simple method for the synthesis of hydrogenated thiazolo[4,5-b]quinoxalines [Electronic resource] / V. G. Baklykov, V. N. Charushin, O. N. Chupakhin, V. N. Drozd // Chemistry of Heterocyclic Compounds. - 1984. - Vol. 20, № 5. - P554-558. - Bibliogr. : p. 558 (13 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
THIOACETAMIDES -- THIOBENZAMIDES -- N-ALKYLQUINOXALINLUM SALTS
Аннотация: Thioacetamides and thiobenzamides undergo cyclization with N-alkylquinoxalinium salts in the presence of bases to give 4-alkyl-3a,4,9,9a-tetrahydrothiazolo[4,5-b]quinoxalines

\\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\1984, v.20, N 5, p. 554.pdf
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4.
Инвентарный номер: нет.
   
   C 98


   
    Cyclization of N-alkylazinium cations with bifunctional nucleophiles. 14. Reaction of quinoxalinium salts with mono- and N,N′-disubstituted amidines / L. M. Naumova, V. N. Charushin, O. N. Chupakhin, G. G. Izmailova // Chemistry of Heterocyclic Compounds. - 1985. - Vol. 21, № 3. - С. 326-331. - Bibliogr. : p. 330-331 (7 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
BENZAMIDINES -- QUINOXALINUM SALTS
Аннотация: Monosubstituted benzamidines undergo cyclization with quinoxalinum salts to give 1,2-disubstituted 3a,4,9,9a-tetrahydroimidazo[4,5-b]quinoxalines. The participation in similar cyclizations of N,N′-disubstituted amidines with a CH-active group in the a position leads to 3a,4,9,9a-tetrahydropyrrolo[2,3-b]quinoxalines

\\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\1985, v.21, N 3, p. 326.pdf
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5.
Инвентарный номер: нет.
   
   C 98


   
    Cyclization of N-alkylazinium cations with bifunctional nucleophiles. 15. Isomerization of thiazolo[4,5-b]quinoxalines in the presence of acids [Electronic resource] / V. N. Charushin, V. G. Baklykov, O. N. Chupakhin, V. N. Drozd // Chemistry of Heterocyclic Compounds. - 1985. - Vol. 21, № 3. - С. 331-338. - Bibliogr. : p. 337-338 (21 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ISOMERIZATION -- CHLOROFORM -- QUINOXALINIUM CATION
Аннотация: 4-Alkyl-2-phenyl-3a,4,9,9a-tetrahydrothiazolo[4,5-b]quinoxalines undergo isomerization in chloroform in the presence of acids to the regioisomeric (with respect to them) 9-alkyl-substituted derivatives. Under the same conditions 2,4-dimethyl-3a,4-9,9a-tetrahydrothiazolo [4,5-b]quinoxaline undergoes isomerization to 4-methyl-1H-2,3,3a,4,9,9a-hexahydropyrrolo[2,3-b]quinoxaline-2-thione. It was demonstrated by means of deuterium labels that in both cases the isomerization proceeds through a step involving dissociation to a quinoxalinium cation and the corresponding thioamide

\\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\1985, v.21, N 3, p. 331.pdf
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6.
Инвентарный номер: нет.
   
   C 98


   
    Cyclization of N-alkylazinium cations with bifunctional nucleophiles. 16. σ-adducts of quinoxalinium salts with amines, alcohols, and enolates and their role in cyclizations with β-dicarbonyl compounds [Electronic resource] / V. N. Charushin, M. G. Ponizovskii, O. N. Chupakhin, E. O. Sidorov, I. M. Sosonkin // Chemistry of Heterocyclic Compounds. - 1985. - Vol. 21, № 5. - С. 564-572. - Bibliogr. : p. 571-572 (16 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ACETYLACETONE -- 1H NMR SPECTROSCOPY -- N-METHYLQUINOXALINIUM CATION
Аннотация: In the reaction of N-methylquinoxalinium iodide with acetylacetone at −30 °C, the formation of 3-acetyl-2,4-dimethyl-3a,4,9,9a-tetrahydrofuro[2,3-b]quinoxaline has been recorded by 1H NMR spectroscopy, this being a regioisomer of the 3-acetyl-2,9-dimethyl-3a,4,9,9a-tetrahydro[2,3-b]quinoxaline formed in this reaction at temperatures above −10 °C. σ-Adducts of the N-methylquinoxalinium cation with alcohols, amines, and β-diketones have also been identified, and their role in cyclizations leading to the annelation of a furan ring is discussed.

\\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\1985, v.21, N 5, p. 564.pdf
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7.
Инвентарный номер: нет.
   
   C 98


   
    Cyclization of N-alkylazinium cations with bifunctional nucleophiles. 23. Electrochemical criteria for electrophilicity in 1,4-diazinium cations and their participation in cyclizations with acetoacetamide [Electronic resource] / I. M. Sosonkin, G. L. Kalb, I. V. Kazantseva, M. G. Ponizovskii, V. N. Charushin, O. N. Chupakhin // Chemistry of Heterocyclic Compounds. - 1987. - Vol. 23, № 8. - С. 888-895. - Bibliogr. : p. 894-895 (22 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
PYRAZINIUM -- QUINOXALINIUM -- BENZOQUINOXALINIUM
Аннотация: The polarographic reduction potentials E1/2 of the pyrazinium, quinoxalinium, benzoquinoxalinium, pyrido[2,3-b]pyrazinium, and pteridinium cations were determined. Annellation of a benzene ring increases the electrophilicity of the diazinium cations to a greater degree than the introduction of such electron acceptors as aza, aminocarbonyl, or methoxycarbonyl groups. The boundary between the active and inactive 1,4-diazinium salts was determined; cations with E1/2 values more negative than −0.50 V do not form either stable covalent adducts or cyclic diadducts through annellation of the dinucleophiles to the pyrazine ring.

\\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\1987, v.23, N 8, p. 888.pdf
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8.
Инвентарный номер: нет.
   
   N 30


    Naumova, L. M.
    Cyclization of N-alkylazinium cations with bifunctional nucleophiles. 24. Synthesis of condensed 1,2,4-triazino- and 1,2,4-oxadiazino[5,6-b]quinoxaline systems [Electronic resource] / L. M. Naumova, V. N. Charushin, O. N. Chupakhin // Chemistry of Heterocyclic Compounds. - 1987. - Vol. 23, № 8. - С. 895-899. - Bibliogr. : p. 898-899 (19 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
CYCLIZATION -- QUINOXALINUM SALTS -- AMIDHYDRAZONES
Аннотация: Cyclization of quinoxalinium salts with amidoximes and amidhydrazones yields partially hydrogenated derivatives of new 1,2,4-oxadiazino- and 1,2,4-triazino[5,6-b]quinoxaline heterocyclic systems.

\\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\1987, v.23, N 8, p. 895.pdf
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9.
Инвентарный номер: нет.
   
   C 98


   
    Cyclization of N-alkylazinium cations with binucleophiles. 8. Annellation of the imidazole ring with pyrazines and quinoxalines [Electronic resource] / V. N. Charushin, V. G. Baklykov, O. N. Chupakhin, N. N. Vereshchagina, L. M. Naumova, N. N. Sorokin // Chemistry of Heterocyclic Compounds. - 1983. - Vol. 19, № 12. - P1333-1338. - Bibliogr. : p. 1337-1338 (15 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
PYRAZINIUM ION -- QUINOXALINIUM ION
Аннотация: Monosubstituted and N,N′-disubstituted thioureas enter into cyclization with pyrazinium and quinoxalinium ion to form imidazo[4,5-b]-annellated pyrazines and quinoxalines

\\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\1983, v.19, N 12, p. 1333.pdf
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10.
Инвентарный номер: нет.
   
   C 98


   
    Cyclization of n-alkylazinium cations with bisnucleophiles. 4. Regio- and stereospecificity of the reactions of β-diketones with quinoxalinium salts and their aza and benzo analogs [Electronic resource] / V. N. Charushin, M. G. Ponizovskii, O. N. Chupakhin, A. I. Rezvukhin, G. M. Petrova, Yu. A. Efremov // Chemistry of Heterocyclic Compounds. - 1981. - Vol. 17, № 11. - P1129-1134. - Bibliogr. : p. 1134 (10 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
QUINOXALINIUM -- PYRAZINIUM SALTS -- BISNUCLEOPHILES
Аннотация: The reactions of substituted quinoxalinium, benzo[g]- and benzo[f]quinoxalinium, and pyrido[2,3-b]pyrazinium salts with anions of β-dicarbonyl compounds give furo[2,3-b]-annelated systems with strictly determined regio- and stereoorientations

\\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\1981, v.17, N 11, p.1129.pdf
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