Вид документа : Статья из журнала Шифр издания : 54/C 98 Автор(ы) : Charushin V. N., Ponizovskii M. G., Chupakhin O. N., Sidorov E. O., Sosonkin I. M. Заглавие : 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 [Электронный ресурс] Место публикации : Chemistry of Heterocyclic Compounds. - 1985. - Vol. 21, № 5. - С. 564-572 Систем. требования: http://link.springer.com/article/10.1007/BF00506075 Примечания : Bibliogr. : p. 571-572 (16 ref.). - 12.10.15 ББК : 54 Предметные рубрики: ХИМИЧЕСКИЕ НАУКИ Ключевые слова (''Своб.индексиров.''): 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. Доп.точки доступа: Charushin, V. N.; Ponizovskii, M. G.; Chupakhin, O. N.; Sidorov, E. O.; Sosonkin, I. M.