C 98 Cyclization of n-alkylazinium cations with bisnucleophiles. 5. Cyclic adducts and recyclization products in the reactions of benzodiazinium cations with imido esters [Electronic resource] / O. N. Chupakhin, V. N. Charushin, L. M. Naumova, A. I. Rezvukhin, N. A. Klyuev // Chemistry of Heterocyclic Compounds. - 1981. - Vol. 17, № 11. - P1134-1138. - Bibliogr. : p. 1138 (23 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): METHYLENE GROUP -- BENZODIAZINIUM CATIONS -- ESTERS Аннотация: The reaction of imido esters that contain an active methylene group with four isomeric benzodiazinium cations, viz., the 1-methylquinoxalinium, 2-methylcinnolinium, 3-methylquinazolinium, and 2-methylphthalazinium cations, was investigated. The 1-methylquinoxalinium cation reacts with imido esters via a scheme involving anionic [3- +2]-cycloaddition to form tetrahydropyrrolo[2,3-b]quinoxalines. The 2-methylcinnolinium cation forms an adduct with an annelated pyrrole ring. Under the influence of imido esters, the 3-methylquinazolinium cation undergoes recyclization to a 2,3-disubstituted quinoline. The 2-methylphthalazinium cation is inert in this reaction \\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\1981, v.17, N 11, p.1134.pdf |
C 98 Cyclization of N-alkylazinium cations with bisnucleophiles. 7. Reactions of quinoxalinium salts with α-substituted acetamides [Electronic resource] / V. N. Charushin, L. M. Naumova, G. G. Izmailova, O. N. Chupakhin // Chemistry of Heterocyclic Compounds. - 1983. - Vol. 19, № 8. - P901-905. - Bibliogr. : p. 905 (5 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): QUINOX-ALINIUM SALTS -- ACETAMIDES Аннотация: Acetamides that contain acceptor substituents in the α position react with quinox-alinium salts to give cis-hexahydropyrrolo[2,3-b]quinoxalin-2-ones. Acetic acid arylamides are inert under these conditions. \\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\1983, v.19, N 8, p. 901.pdf |
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.) 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 |
D 62 Direct annelation of six-membered heterocycles with a quinoxaline ring [Electronic resource] / O. N. Chupakhin, V. N. Charushin, M. G. Ponizovskii, L. M. Naumova // Chemistry of Heterocyclic Compounds. - 1984. - Vol. 20, № 5. - P575-576. - Bibliogr. : p. 576 (2 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): QUINOXALINES -- HETEROCYCLES \\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\1984, v.20, N 5, p. 575.pdf |
D 62 Direct fusion of a triazine to a pyrazine ring. Synthesis of derivatives of [1,2,4]triazino[5,6-b]quinoxaline [Electronic resource] / V. N. Charushin, V. G. Baklykov, O. N. Chupakhin, L. M. Naumova // Chemistry of Heterocyclic Compounds. - 1984. - Vol. 20, № 9. - P1057-1058. - Bibliogr. : p. 1058 (2 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): TRIAZINES -- PYRAZINES \\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\1984, v.20, N 9, p. 1057.pdf |
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.) 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 |
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.) 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 |
C 98 Cyclization of N-alkylazinium cations with bifunctional nucleophiles. 25. Oxidation of tetrahydroquinoxalines condensed with six-membered ring heterocycles [Electronic resource] / V. N. Charushin, L. M. Naumova, M. G. Ponizovskii, V. G. Baklykov, O. N. Chupakhin // Chemistry of Heterocyclic Compounds. - 1987. - Vol. 23, № 9. - С. 1010-1013. - Bibliogr. : p. 1013 (11 ref.) Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): TETRAHYDROQUINOXALINES -- POTASSIUM PERMANGANATE -- OXIDATION PRODUCTS Аннотация: Reaction of six-membered ring heterocycle-annulated tetrahydroquinoxalines with potassium permanganate in acetone results in the formation of oxidation products containing a common system of conjugated double bonds. \\\\expert2\\nbo\\Chemistry of Heterocyclic Compounds\\1987, v.23, N 9, p. 1010.pdf |