T 44 The first synthesis of 4-unsubstituted 3-(trifluoroacetyl)coumarins by the Knoevenagel condensation of salicylaldehydes with ethyl trifluoroacetoacetate followed by chromene-coumarin recyclization [Text] / D. L. Chizhov, V. Ya. Sosnovskikh, M. V. Pryadeina, Ya. V. Burgart, V. I. Saloutin, V. N. Charushin // Synlett. - 2008. - № 2. - P281-285 Рубрики: ХИМИЧЕСКИЕ НАУКИ \\\\expert2\\nbo\\Synlett\\2008. N 2. P. 281-285.pdf |
T 82 Transformations of 2-azido-5-nitropyrimidine in reactions wirh pyridinium ylides / E. B. Gorbunov, G. L. Rusinov, O. N. Chupakhin, V. N. Charushin // 8-th Eurasian meeting on heterocyclic chemistry (EAMHC), Tbilisi, Georgia, 20-24 september 2014. - Tbilisi, 2014. - С. 174-715 Рубрики: ХИМИЧЕСКИЕ НАУКИ Кл.слова (ненормированные): NITROAINES -- NUCLEOPHILIC ATTACK -- RECYCLIZATION |
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 |