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1.
Инвентарный номер: нет.
   
   R 30


   
    Reactions of azinium ions. 4. Reactions of quinoxalinium salts with nitroalkanes — Single-stage path to tetraazaheterocycles with bridged and framework structures [Electronic resource] / V. N. Charushin, G. M. Petrova, O. N. Chupakhin, E. O. Sidorov, G. G. Aleksandrov, A. I. Chernyshev, N. A. Klyuev, N. N. Sorokin // Chemistry of Heterocyclic Compounds. - 1986. - Vol. 22, № 3. - С. 318-328. - Bibliogr. : p. 327-328 (11 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
AZINIUM IONS -- QUINOXALINUM SALTS -- NITROALKANES
Аннотация: The addition of the carbanions of nitroalkanes of N-alkylquinoxalinium salts in an alcohol medium leads to dibenzo [d,k]-1,3,6,10-tetrasubstituted tricyclo[7.3.1.02,7]-and tetracyclo[7.3.1.02,706,13]tridecanes.

\\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\1986, v.22, N 3, p. 318.pdf
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2.
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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3.
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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4.
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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5.
Инвентарный номер: нет.
   
   R 30


   
    Reactions of azinium cations. 7. 13C NMR spectra and electron structure of neutral σ-adducts of 1,4-diazinium cations and methylate anion [Electronic resource] / O. N. Chupakhin, V. N. Charushin, I. V. Kazantseva, M. G. Ponizovskii, E. O. Sidorov, P. A. Torgashev, A. V. Belik // Chemistry of Heterocyclic Compounds. - 1987. - Vol. 23, № 10. - С. 1112-1117. - Bibliogr. : p. 1116-1117 (23 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
NMR SPECTRA -- σ-ADDUCTS -- PYRAZINIUM
Аннотация: The 13C NMR spectra have been recorded of a number of σ-adducts formed by pyrazinium, quinoxalinium, and pteridinium cations with methylate anion. The experimental data were compared with CNDO/2 calculations of adduct electron structure.

\\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\1987, v.23, N 10, p. 1112.pdf
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6.
Инвентарный номер: нет.
   
   C 98


   
    Cyclizations of N-alkyl-substituted azinium cations with bifunctional nucleophiles. 28. Orientation of the nucleophile in the reaction of quinoxalinium salts with indan-1,3-dione [Electronic resource] / G. M. Petrova, M. G. Ponizovskii, V. N. Charushin, G. G. Aleksandrov, E. O. Sidorov, O. N. Chupakhin // Chemistry of Heterocyclic Compounds. - 1990. - Vol. 26, № 5. - С. 565-572. - Bibliogr. : p. 572 (12 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
QUINOXALINUM SALTS -- C-NUCLEOPHILES -- AZINIUM CATIONS
Аннотация: In reactions with quinoxalinium salts in alcoholic-base media indan-1,3-dione acts as a C nucleophile, adding at the 2 or 3 position of the heterocycle to give the corresponding ylidene derivatives; attack by the nucleophile at the C(3) atom (the Β position relative to the quaternary nitrogen atom) is preceded by addition of alcohol at the a position. Dissociative substitution at the C(2) atom in 2-alkoxy-3-(1,3-dioxoindan-2-ylidene)-1,2,3,4-tetrahydroquinoxalines by another nucleophile makes it possible to regard lyate complexes as probable intermediates in cyclizations of 1,4-diazinium salts with dinucleophiles.

\\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\1990, v.26, N 5, p.565.pdf
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7.
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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8.
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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9.
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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10.
Инвентарный номер: нет.
   
   R 30


   
    Reactions of N-alkylazinium cations. 2. Reaction of quinoxalinium salts with malonodinitrile and cyanoacetic ester [Electronic resource] / V. N. Charushin, O. N. Chupakhin, G. M. Petrova, E. O. Sidorov, N. A. Klyuev, L. G. Egorova // Chemistry of Heterocyclic Compounds. - 1981. - Vol. 17, № 2. - P189-194. - Bibliogr. : p. 194 (12 ref.)
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
N-ALKYLQUINOXALINLUM SALTS -- MALONODINITRILE -- CYANOACETIC ESTER CARBANIONS
Аннотация: N-Alkylquinoxalinlum salts react with malonodinitrile and cyanoacetic ester carbanions to give addition products, which, due to favorably disposed CN groups and active CH centers, subsequently undergo intramolecular cyclization with the formation of a five-membered ring.

\\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\1981, v.17, N 2, p.189.pdf
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