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1.
B. A. Tertov Yu. G. Bogachev Yu. V. Koshchienko G. M. Suvorova E. B. Tsupak N. K. Chub S. F. Breus 《Chemistry of Heterocyclic Compounds》1986,22(8):868-872
Organolithium and organosodium compounds of 1,2-dimethyl-, 1-methyl-2-ethyl-, 1-methyl-2-propyl-, and 1-phenyl-2-methylbenzimidazole, containing the metal in the alkyl group at position C(2), were obtained by metallation. It was found that metallation can be complicated by the addition of the metalling reagent at the C=N bond of the heterocycle. It was shown that the obtained organometallic compounds can be used for the synthesis of various derivatives of benzimidazole.The calculation was performed with the standard bond lengths. A planar model was used for the carbanion.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1073–1077, August, 1986. 相似文献
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The intramolecular electrophilic substitution in 6-functionalized 1,3-dimethyl-1H-pyrrolo[3,4-d]pyrimidine-2,4(3H,6H)-diones was used for the synthesis of pyrimido[4′,5′:3,4]-pyrrolo[1,2-a]quinoxaline-8,10(7H,9H)-dione, pyrimido[4′,5′:3,4]pyrrolo[2,1-c][1,2,4]benzo-triazine-8,10(7H,9H)-dione, and 2H-pyrimido[4′,5′:3,4]pyrrolo[1,2-a]indole-2,4,11(1H, 3H)-trione derivatives.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 12, pp. 2180–2185, December, 2006. 相似文献
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E. B. Tsupak M. A. Shevchenko A. F. Pozharskii Yu. N. Tkachenko 《Chemistry of Heterocyclic Compounds》2003,39(7):953-959
The reaction of 6-amino-1,3-dimethylpyrrolo[3,4-d]pyrimidine-2,4-dione with 1,3-diketones leads to formation of predominantly pyrimido[4',5':3,4]pyrrolo[1,2-b]pyridazine-2,4(1H,3H)-diones and, to a lesser extent, pyrimido[5',4':3,4]pyrrolo[1,2-b]pyridazine-1,3(2H,4H)-diones. The ease and direction of the cyclization reaction suggests a very -electron rich pyrrole ring in the initial state, especially in the position 7. 相似文献
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E. B. Tsupak M. A. Shevchenko Yu. N. Tkachenko D. A. Nazarov 《Russian Journal of Organic Chemistry》2002,38(6):880-888
6-Hydroxy-5-diazo-6H-uracil and 6-hydroxy-5-diazo-1,3-dimethyl-6H-uracil enter into azo coupling reaction with CH-acids, active phenols, arylamines, and heterocycles. The conditions of reaction depend on the substrate character. 相似文献
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E. B. Tsupak N. K. Chub A. M. Simonov N. M. Miroshnichenko 《Chemistry of Heterocyclic Compounds》1972,8(6):734-737
The hydrochlorides of the corresponding 2-benzimidazolylmethylhydroxamoyl chlorides were synthesized by the chlorination of 1-methyl-2-formylbenzimidazole oxime and its 5-methyl and 5-nitro derivatives, and 2-benzimidazolylmethylnitrolic acids were obtained by nitration of the oximes. The products of these transformations react with acetylacetone and benzoylacetone in the presence of bases to give 1,5-substituted 3-[2-benzimidazolyl]-4-acyl-5-methylisoxazoles.See [1] for communication XXVII.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 812–815, June, 1972. 相似文献
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Structure and Reactivity of Uracil Derivatives. 2. Ambident Nucleophilic Reactivity of 5-Diazouracil
On the basis of 3-21G type ab initio calculations we have studied all the possible complexes of 5-diazouracil with boron trifluoride. The most stable of these are the systems with the BF3 coordinated at the 3, 9, and 10 positions of the heterocyclic molecule. 相似文献
7.
E. B. Tsupak M. A. Shevchenko V. V. Kostrub Yu. N. Tkachenko 《Russian Chemical Bulletin》2007,56(11):2330-2336
5-Aroyl-1,3,6-trimethyluracils were converted to pyrano[4,3-d]pyrimidinium salts. Reactions of the salts obtained with ammonia, primary amines, and hydrazine were studied.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 2251–2257, November, 2007. 相似文献
8.
Reactions of 1,3-dimethyl-2,4-dioxo-1H,3H-pyrano[4,3-d]pyrimidinium salts with azomethines have been studied. The reactions lead to 1,3-dimethyl-2,4-dioxo-1H,3H-pyrido-[4,3-d]pyrimidinium salts and aromatic aldehydes. 相似文献
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