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21.
The oxidation of diethyl 1-methyl- or 1-aryl-2,6-dimethyl-4-aryl-1,4-dihydropyridine-3,5-dicarboxylates with hydrogen peroxide in the presence of perchloric acid gave the perchlorates of the corresponding pyridinium ions, the reduction of which with NaBH4 is a preparative method for the synthesis of diethyl esters of 1-substituted 2,6-dimethyl-1,2-dihydropyridine-3,5-dicarboxylic acids. Derivatives of the 5-carboxylic acid of the corresponding 1,2-dihydropyridine are formed by alkaline hydrolysis of these esters.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp. 1225–1228, September, 1982. 相似文献
22.
V. K. Lusis D. Kh. Mutsenietse G. Ya. Dubur 《Chemistry of Heterocyclic Compounds》1986,22(10):1104-1107
The splitting of the dihydropyridine ring of N-methyl-substituted 4-phenyl-5-oxo-4,5-dihydroindeno[1,2-b]pyridine in an acid medium takes place at the C-N bond. During the splitting of 1,2-dimethyl-4-phenyl-4,5-dihydroindeno[1,2-b]-pyridine, 4-phenyl-4-(indane-1,3-dion-2-yl)butan-2-one is formed, while in the case of the 3-ethoxycarbonyl derivative of indenopyridine, together with the Michael retroreaction leading to 2-benzylideneindane-1,3-dione, a recyclization of the intermediate product into a derivative of dihydroindeno-2-pyridone takes place.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, 1363–1366, October, 1986. 相似文献
23.
V. K. Lusis D. Kh. Mutsenietse A. Z. Zandersons I. B. Mazheika G. Ya. Dubur 《Chemistry of Heterocyclic Compounds》1984,20(3):318-323
2-Methyl-4-aryl-5-oxo-4,5-dihydro-1H-indeno[1,2-b]pyridine derivatives react with methyl iodide in an aprotic medium in the presence of alkaline agents to give C- and N-alkylation products, viz., 2,4a-dimethyl- and 1,2-dimethyl-4-aryl-5-oxo-4,5-dihydroindeno[1,2-b]pyridines, and with dimethyl sulfate or methyl p-tosylate under the same conditions to give N-methylation products.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 393–398, March, 1984. 相似文献
24.
D. Kh. Mutsenietse A. Z. Zandersons V. K. Lusis G. Ya. Dubur 《Chemistry of Heterocyclic Compounds》1987,23(1):70-73
5,9b-Dihydro derivatives of indeno[1,2-b]pyridine were obtained by the reduction of the corresponding 1,2-dimethyl-4-aryl-5-oxoindeno[1,2-b]pyridinium perchlorates. 1,2-Dimethyl-3-ethoxycarbonyl-4-phenyl-5-oxoindeno[1,2-b]pyridinium perchlorate forms in alkaline medium with splitting, recyclization and deamination products.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp 86–89, January, 1987. 相似文献
25.
G. P. Shkil' L. V. Berdovich V. Lusis D. Mutsenietse R. S. Sagitullin 《Chemistry of Heterocyclic Compounds》1995,31(1):76-79
Some quaternary salts of asymmetric substituted pyridines with functional group at the 3- and 5-positions have been synthesized. It has been established that when there is an ester group present, the latter participates in the recyclization of the salts on treatment with alkali, resulting in the formation of pyridine-2-ones. 相似文献