共查询到20条相似文献,搜索用时 31 毫秒
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G. G. Danagulyan A. D. Mkrtchyan G. A. Panosyan 《Chemistry of Heterocyclic Compounds》2005,41(4):485-491
Condensation in ethanol of ethyl ethoxymethyleneacetoacetate with systems containing an amidine fragment (substituted 3-aminopyrazoles and 3-amino-1,2,4-triazole) gave 6-carbethoxy-7-methylpyrazolo[1,5-a]pyrimidines. Addition of base to solutions of the obtained bicyclic carbethoxy derivatives in the course of several minutes caused rearrangement to 6-acetyl-7-hydroxypyrazolo[1,5-a]pyrimidine and 6-acetyl-7-hydroxy-1,2,4-triazolo[1,5-a]pyrimidine respectively. A more prolonged refluxing in 15% aqueous alcohol solution of base caused 6-carbethoxy-7-methyl-2-phenylpyrazolo[1,5-a]pyrimidine and 6-acetyl-7-hydroxy-2-phenylpyrazolo[1,5-a]pyrimidine to recyclize to 7-methylpyrazolo[1,5-a]pyrimidine.__________Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 569–576, April, 2005. 相似文献
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以2-溴丙酸甲酯、α,α-二氯甲基甲醚和胍唑为原料, 经缩合以及环化反应制得2-氨基-6-甲基-5-氧代-4,5-二氢-1,2,4-三氮唑并[1,5-a]嘧啶. 为了提高其在有机溶剂中的溶解性, 该化合物再同1-溴丁烷发生亲核取代反应得到了2-氨基-6-甲基-5-氧代-4-正丁基-4,5-二氢-1,2,4-三氮唑并[1,5-a]嘧啶, 然后与芳基醛和叔丁基异氰发生Ugi多组分反应, 合成了一系列具有潜在催吐活性的2-取代氨基-6-甲基-5-氧代-4-正丁基-4,5-二氢-1,2,4-三氮唑并[1,5-a]嘧啶类衍生物, 产品结构经质谱、核磁共振谱及元素分析确认. 相似文献
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L. M. Mironovich M. A. Ivanov E. P. Koval'chuk 《Chemistry of Heterocyclic Compounds》2001,37(9):1150-1152
8-tert-Butyl-9-oxo-1,2,4-triazolo[4,5-b]-1,2,4-triazolo[3,4-c]-1,2,4-triazine has been synthesized by the interaction of 6-tert-butyl-3-hydrazino-1,2,4-triazolo[3,4-c]-1,2,4-triazin-5-one with formic acid. The conditions of carrying out the reaction are discussed. Spectral characteristics are given. 相似文献
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G. G. Danagulyan L. G. Saakyan G. A. Panosyan G. A. Bulakhov P. B. Terent'ev M. G. Zalinyan 《Chemistry of Heterocyclic Compounds》1993,29(11):1332-1334
Refluxing 4-allyl-7-benzyl-5-methyl-1,2,4-triazolo[4,3-c]pyrimidine in an alcohol solution of sodium ethylate causes a Dimroth rearrangement together with a prototropic isomerization of the allyl fragment to give 7-benzyl-5-methyl-4-propenyl-1,2,4-triazolo[2,3-c]pyrimidine.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 11, pp. 1545–1547, November, 1993 相似文献
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G. G. Danagulyan L. G. Saakyan M. G. Zalinyan 《Chemistry of Heterocyclic Compounds》1992,28(2):186-188
The Dimroth rearrangement of 7-benzyl-5-methyl-1,2,4-triazolo[4,3-c]pyrimidine to 7-benzyl-5-methyl-1,2,4-triazolo[2,3-c]pyrimidine was realized by the action of sodium ethoxide and other nucleophilic agents. The rearrangement was investigated by the dynamic PMR spectroscopic method.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, pp. 225–227, February, 1992. 相似文献
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Twelve [1,2,4]-triazolo[1,5-a]pyrimidine derivatives had been designed and synthesized by using substituted hydrazine hydrate as starting materials.The synthesized compounds were confirmed by elemental analysis,Infrared spectra and 1~H NMR techniques.Preliminary bioassay indicated that some of them displayed good herbicidal activities. 相似文献
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以2-苄硫基-5-甲基-7-羟基-1,2,4-三唑并[1,5-a]嘧啶为原料,经醚化、肼解、成盐、关环和席夫碱反应合成了20个新型的含1,2,4-三唑-5-硫酮席夫碱的1,2,4-三唑并[1,5-a]嘧啶类化合物,通过IR,1H NMR,MS和元素分析对所合成的化合物进行了结构表征.初步生物活性测试结果表明,部分化合物表现出一定的抑菌或较好的抗烟草花叶病毒(TMV)活性.在500μg/mL浓度下,化合物6b,6f和6p对TMV的抑制率分别为41%,43%和40%. 相似文献
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The interaction of 4-allyl-5-phenyl-1,2,4-triazole-3-thione with iodine proceeds with the formation of a mixture of 6-iodomethyl-3-phenyl-5,6-dihydrothiazolo[2,3-c]-1,2,4-triazole and 6-iodo-3-phenyl-6,7-dihydro-5H-1,2,4-triazolo[3,4-b]-1,3-thiazine. The structures of the cyclization products obtained were established on the basis of the 1H NMR spectra of their dehydroiodinated derivatives. 6-Methyl-3-phenylthiazolo[2,3-c]-1,2,4-triazole, 3-phenyl-5H-1,2,4-triazolo[3,4-b]-1,3-thiazine, and 3-phenyl-7H-1,2,4-triazolo[3,4-b]-1,3-thiazine are formed on eliminating HI from the cyclization products. 相似文献
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为了寻找新的含苯并噻唑稠杂环农药先导化合物,利用取代2-肼基苯并噻唑与取代苯甲酸在三氯氧磷中回流反应,合成了18个新型取代3-芳基-1,2,4-三唑并[3,4-b]苯并噻唑化合物,并利用1H NMR,EI-MS及元素分析对其结构进行了表征.初步生物活性试验结果表明,在50 mg/L浓度下,部分目标化合物对立枯丝核菌(Rhizoctonia solani)、西瓜壳二孢菌(Ascochyta citrullina)、香蕉枯萎病菌(Fusarium oxysporum f.sp.cubense)、烟草炭疽病菌(Colletotrichum nicotianae)具有中等杀菌活性.然而,部分化合物对灰葡萄孢菌(Botrytis cinerea)反而起到一定促进生长作用. 相似文献
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The reaction of 3-allylthio-5-phenyl-4H-1,2,4-triazole with iodine to give a mixture of 5,6-dihydro-5-iodomethyl-3-phenyl[1,3]thiazolo[2,3-c][1,2,4]triazole, 6,7-dihydro-6-iodo-3-phenyl-5H-[1,2,4]triazolo[3,4-b][1,3]thiazine, 5,6-dihydro-6-iodomethyl-2-phenyl[1,3]thiazolo[3,2-b][1,2,4]triazole, and 6,7-dihydro-6-iodo-2-phenyl-5H-[1,2,4]triazolo[5,1-b][1,3]thiazine has been studied. The structure of the products obtained was established using 1H NMR spectroscopy of their dehydriodination products. 相似文献
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A. Sh. Oganisyan A. S. Noravyan M. Zh. Grigoryan 《Chemistry of Heterocyclic Compounds》2004,40(1):75-78
Novel dihydro-5H-pyrano[3',4':5',6']pyrido[2,3-d]-1,2,4-triazolo[4,3-c]pyrimidines and 1,2,3,4-tetrazolo[1,5-c]pyrimidines have been synthesized from 2-amino-3-cyano-7,7-dimethyl-7,8-dihydro-5H-pyrano[4,3-b]pyridine. 相似文献
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V. V. Lipson S. M. Desenko I. V. Ignatenko O. V. Shishkin S. V. Shishkina 《Russian Chemical Bulletin》2006,55(2):345-350
The reaction of 5-methyl-7-phenyl-4,7-dihydro-1,2,4-triazolo[1,5-a]pyrimidine with α,β-unsaturated carbonyl compounds in MeOH in the presence of MeONa affords partially hydrogenated aryl-substituted
[1,2,4]triazolo[5,1-b]quinazolines. Hydrolysis, oxidation, reduction, and alkylation of 5,6,8-triphenyl-5,6,7,10-tetrahydro[1,2,4]triazolo[5,1-b]quinazoline were studied. The structure of one oxidation product, viz., 7-hydroxy-5,6,8-triphenyl-6,7-dihydro[1,2,4]triazolo[5,1-b]quinazoline, was established by X-ray diffraction.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 2, pp. 335—340, February, 2006. 相似文献
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Essam Kh. Ahmed 《Phosphorus, sulfur, and silicon and the related elements》2013,188(5):1323-1336
Diethyl 2-isothiocyanato-4,5,6,7-tetrahydrothieno[2,3-c]pyridine-3,6 dicarboxylate 1 is a convenient and useful starting matrial for the constructions of heterocyclic systems. It was utilized to synthesize derivatives of the novel heterocyclic systems pyrido[4',3':4,5]thieno[2,3-d]pyrimidine 4 , 10 , pyrido[4',3':4,5]thieno[2,3-d]-[1,2,4]triazolo[1,5-a]pyrimidine 7 , 11a-e and pyrido[4',3':4,5]thieno[2,3-d][1,3,4]thiadiazolo[3,2-a]pyrimidine 12-14 . 相似文献
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V. V. Lipson V. V. Borodina M. G. Shirobokova S. M. Desenko O. V. Shishkin R. I. Zubatyuk 《Chemistry of Heterocyclic Compounds》2007,43(4):490-495
Interaction of 3-amino-5-methylpyrazole, 3-amino-5-methylthio-, and 3,5-diamino-1,2,4-triazole with Meldrum’s acid, acetone,
ethyl methyl ketone, and cyclohexanone leads to alkyl-substituted pyrazolo[3,4-b]pyridin-6-ones and 1,2,4-triazolo[1,5-a]pyrimidin-7-ones
respectively. The structure of 5,5-dimethyl-2-methylthio-4,5,6,7-tetrahydro-1,2,4-triazolo[1,5-a]pyrimidin-7-one was demonstrated
by an X-ray structural investigation.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 595–601, April, 2007. 相似文献
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A. M. El Massry 《Phosphorus, sulfur, and silicon and the related elements》2013,188(5):1143-1155
Reaction of phenylpyruvic acid with semicarbazide afforded 6-benzyl-2H-[1,2,4]triazine-3,5-dione ( 1 ) which upon oxidation with potassium dichromate furnished 6-benzoyl-2H-[1,2,4]triazine-3,5-dione ( 2 ) in good yield. Constructing pyrazolo[3,4-e][1,2,4]triazine system ( 4 ) was achieved by reacting 2 with arylhydrazines in ethanolic solution. However treatment of 2 with the less reactive heteroarylhydrazines gave only the corresponding hydrazones ( 3 ). Attempt for constructing 1,2,4,5,10-pentaaza-dibenzo[a,d]cyclohept-3-one ( 7 ) from 2 was failed and (benzoimidazol-2-yl) [1,2,4] triazine derivative ( 6 ) was the only product. Reaction of 1 with phosphorus pentasulphide afforded compounds 8 and 9 . Compound 8 was transformed to the hydrazino compound 14 , which led to the construction of triazolo[4,3-d] [1,2,4]triazine system. Thus compounds 15 and 16 were obtained by reacting 14 with carbon disulfide or acetic anhydride respectively. Attempt to couple 8 with chloroacetic acid failed, while it's known isomer 10 led to the formation of thiazolo [2,3-c] [1,2,4]triazine derivative ( 13 ). Simple theoretical calculation using AM1 and PM3 semiempirical Hamitonian provided rational ways to correlate the reactivity with structure proposed. 相似文献
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V. L. Rusinov E. N. Ulomskii O. N. Chupakhin V. N. Charushin 《Russian Chemical Bulletin》2008,57(5):985-1014
Synthetic methods, reactivity, and the properties of a new class of antiviral compounds, pyrazolo-, imidazo-, 1,2,4-triazolo[5,1-c]-1,2,4-triazinones, tetrazolo[5,1-b]-1,2,4-triazinones, and azoloannulated amino-1,2,4-triazines having structural similarity with biogenic purines and capable
of mimicking them in metabolic processes are considered.
Published in Russian in Izvestiya Akademii Nauk. Seriya Khimicheskaya, No. 5, pp. 967–995, May, 2008. 相似文献
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V. V. Lipson S. M. Desenko V. D. Orlov O. V. Shishkin M. G. Shirobokova V. N. Chernenko L. I. Zinov'eva 《Chemistry of Heterocyclic Compounds》2000,36(11):1329-1335
We have studied the reactions of 3-amino, 3,5-diamino-, and 3-amino-5-trifluoromethyl-1,2,4-triazole with esters of substituted cinnamic acids and aromatic unsaturated ketones; we have established the directionality of formation of the tetrahydrooxopyrimidine ring. We have carried out hydrolysis and hydrazinolysis of 7-phenyl-4,5,6,7-tetrahydro-1,2,4-triazolo[1,5-a]pyrimidin-5-one. We have conducted an X-ray diffraction study of isopropylidene hydrazide of 3-(5-amino-1,2,4-triazol-1-yl)-3-phenylpropionic acid. 相似文献