Вид документа : Статья из журнала Шифр издания : 54/C 98 Автор(ы) : Baklykov V. G., Charushin V. N., Chupakhin O. N., Sorokin N. N. Заглавие : 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 [Электронный ресурс] Место публикации : Chemistry of Heterocyclic Compounds. - 1985. - Vol. 21, № 7. - С. 798-804 Систем. требования: http://link.springer.com/article/10.1007/BF00519151 Примечания : Bibliogr. : p. . - 12.10.15 ББК : 54 Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ Ключевые слова (''Своб.индексиров.''): 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. Доп.точки доступа: Baklykov, V. G.; Charushin, V. N.; Chupakhin, O. N.; Sorokin, N. N.