共查询到20条相似文献,搜索用时 15 毫秒
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L. G. Voskressensky M. V. Ovcharov T. N. Borisova L. N. Kulikova A. V. Listratova R. S. Borisov A. V. Varlamov 《Chemistry of Heterocyclic Compounds》2011,47(2):222-228
It has been established that 2-R-4-oxotetrahydropyrido[4,3-d]pyrimidines, under the action of activated alkynes in methanol, form a mixture of 2-R-4-oxohexahydropyrimido[4,5-d]azocines and products of decomposition of the tetrahydropyridine ring, the 2-R-5-methoxymethyl-4-oxo-6-vinylaminoethyl-pyrimidines. Tetrahydropyrido[3,4-d]pyrimidine, isomeric at the junction of the pyrimidine and tetrahydropyridine rings, forms only the corresponding pyrimido[5,4-d]azocine, the product of expansion, under the action of methyl propiolate. 相似文献
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E. G. Paronikyan A. S. Noravyan A. S. Harutunyan 《Chemistry of Heterocyclic Compounds》2010,46(8):987-990
Methods have been developed for the synthesis of novel derivatives of pyrano[3,4-c]pyridines, 2,7-naphthyridines, and condensed
pyrido[2,3-d]pyrimidines by condensation of thiopyranthiones. 相似文献
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O. B. Ryabova M. I. Evstratova V. A. Makarov V. A. Tafeenko V. G. Granik 《Chemistry of Heterocyclic Compounds》2004,40(10):1352-1358
The reaction of 5-formyl-4-thiocyanatopyrimidines with nitromethane was studied under various conditions. The reaction was found unexpectedly to proceed with closure of a thiophene ring to give thieno[2,3-d]pyrimidines. The use of ammonium acetate as the catalyst leads to a side reaction involving closure of an isothiazole ring to give isothiazolo[5,4-d]pyrimidines. X-ray diffraction crystallographic analysis was used to confirm the structure of thieno[2,3-d]pyrimidine.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1564–1571, October, 2004. 相似文献
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A. A. Shestopalov L. A. Rodinovskaya A. M. Shestopalov V. P. Litvinov 《Russian Chemical Bulletin》2004,53(10):2342-2344
A single-step method for the synthesis of substituted 7-aminopyrano[2,3-d]pyrimidines was developed. The method involves a three-component reaction of barbituric acid or 4,6-dihydroxypyrimidine with aromatic aldehydes and malononitrile in DMF in the presence of N-methylmorpholine as a catalyst.__________Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 10, pp. 2242–2244, October, 2004. 相似文献
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Yu. V. Popova D. V. Osipov V. A. Osyanin Yu. N. Klimochkin 《Russian Journal of Organic Chemistry》2017,53(4):599-603
The condensation of trifluoroacetyl-substituted 4H-chromenes and 1H-benzo[f]chromenes with 6-amino-1,3-dimethyluracil and 6-aminothiouracil afforded a number of pyrido[2,3-d]pyrimidine derivatives containing a 2-hydroxybenzyl or 2-hydroxynaphthalen-1-ylmethyl group in the 6-position as a result of cascade transformation initiated by Michael addition. 相似文献
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An environmentally benign novel one-pot synthesis of pyridines and pyrido[2,3-d]pyrimidines from chalcones and malononitrile was described. In the reaction under neat conditions using microwave irradiation,
enhancement in the reaction rate and high yields were observed.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 6, pp. 1479–1482, June, 2005. 相似文献
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E. G. Paronikian Sh. F. Akopian A. S. Noravian 《Chemistry of Heterocyclic Compounds》2008,44(8):1003-1008
A new methods have been developed for the synthesis of condensed pyrido[2,3-b]thieno[3,2-d]pyrimidines based on cyclic derivatives
of 4-cyanopyridine-3-thiones. The presence of two different reactive functional groups NH2 and CONH gives the possibility of carrying out different conversions of thieno[2,3-b]pyridines.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, 1245–1252, August, 2008. 相似文献
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Yassine Riadi Stephane Massip Jean-Michel Leger Christian Jarry Saïd Lazar Gérald Guillaumet 《Tetrahedron》2012,68(25):5018-5024
A novel and effective route for the synthesis of 2,4-disubstituted pyrido[2,3-d]pyrimidines III is reported starting from the corresponding 2,4-dichloropyridopyrimidine 1 through regioselective functionalization palladium-catalyzed C–C coupling reactions, by two successive palladium-catalyzed reactions involving an original regioselective chlorine discrimination. Alternatively, type III compounds were elaborated from 2 by C-2 chlorine further displacement of the C-4 isopropylsulfanyl group, which acted as a temporary C-4 protecting group. Further Suzuki–Miyaura cross-coupling reactions led to C-2 and C-4 disubstituted compounds. 相似文献
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B. Sakram B. Sonyanaik K. Ashok S. Rambabu S. K. Johnmiya 《Research on Chemical Intermediates》2016,42(3):1699-1705