Вид документа : Статья из журнала Шифр издания : 54/C 98 Автор(ы) : Charushin V. N., Baklykov V. G., Chupakhin O. N., Drozd V. N. Заглавие : Cyclization of N-alkylazinium cations with bifunctional nucleophiles. 15. Isomerization of thiazolo[4,5-b]quinoxalines in the presence of acids [Электронный ресурс] Место публикации : Chemistry of Heterocyclic Compounds. - 1985. - Vol. 21, № 3. - С. 331-338 Систем. требования: http://link.springer.com/article/10.1007/BF00506677 Примечания : Bibliogr. : p. 337-338 (21 ref.). - 12.10.15 ББК : 54 Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ Ключевые слова (''Своб.индексиров.''): 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 Доп.точки доступа: Charushin, V. N.; Baklykov, V. G.; Chupakhin, O. N.; Drozd, V. N.