Relevant bibliographies by topics / 5-a]pyrimidines

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  1. Journal articles
  2. Dissertations / Theses
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  4. Conference papers

Academic literature on the topic '5-a]pyrimidines'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "5-a]pyrimidines"

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Elnagdi, Mohamed Hilmy, Nadia Hassen Taha, Fatma Abdel Maksoud Abd El All, Ramadan Maawad Abdel-Motaleb, and Fivian Farouk Mahmoud. "Studies on condensed pyrazoles: Synthesis of new methyl and amino pyrazolo[1,5-a]pyrimidines and of pyrazolo[5,1-c][1,2,4]triazines." Collection of Czechoslovak Chemical Communications 54, no. 4 (1989): 1082–91. http://dx.doi.org/10.1135/cccc19891082.

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A variety of 3-arylazo 5-amino and 7-aminopyrazolo[1,5-a]pyrimidines were obtained via reacting Ia-Id with cinnamonitriles. The structure of products was confirmed via 1H NMR. Both 5-amino- and 7-amino-3-arylazo pyrazolo[1,5-a]pyrimidines reacted, with protons in acetic acid-sulphuric acid mixture to yield the corresponding 3-unsubstituted acetylaminopyrazolo[1,5-a]pyrimidines. Diazotized Ia and Ib coupled with a variety of active methylene reagents to yield pyrazolo[5,1-c][1,2,4]triazines.
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Andrade, Valquiria, Mateus Mittersteiner, Helio Bonacorso, Clarissa Frizzo, Marcos Martins та Nilo Zanatta. "Regioselective Synthesis of 5-(Trifluoromethyl)[1,2,4]triazolo[1,5-a]pyrimidines from β-Enamino Diketones". Synthesis 51, № 11 (2019): 2311–17. http://dx.doi.org/10.1055/s-0037-1611765.

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The use of β-enamino diketones as an easy entry to the regioselective synthesis of [1,2,4]triazolo[1,5-a]pyrimidines is reported. These ketones reacted with 3-amino-1H-1,2,4-triazoles to furnish exclusively 6-substituted 5-(trifluoromethyl)[1,2,4]triazolo[1,5-a]pyrimidines in yields of up to 95%. The regioselectivity of the reactions performed was maintained regardless of the substituent in the starting ketone or aminoazole.
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Behera, Manoranjan, M. Sambaiah, Poosa Mallesham, et al. "Tandem Schiff-Base Formation/Heterocyclization: An Approach to the Synthesis of Fused Pyrazolo–Pyrimidine/Isoxazolo-Pyrimidine Hybrids." Synlett 30, no. 05 (2019): 586–92. http://dx.doi.org/10.1055/s-0037-1612081.

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A new synthesis of pyrazolo[4,3-d]pyrimidines and isoxazolo[4,5-d]pyrimidines is described. Key steps in the synthesis involve Stille coupling of 4,6-dichloro-2-phenyl-pyrimidine with tributyl(1-ethoxyvinyl)stannane and tandem Schiff-base formation/heterocyclization of 2,6-di-aryl-5-fluoro-4-acetylpyrimidine with hydrazines or ­hydroxylamine to give pyrazolo[4,3-d]pyrimidines and isoxazolo[4,5-d]pyrimidines, respectively. The position of the fluoro group in the ­pyrimidine ring is important for the success of heterocylization reaction.
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Chebanov, Valentin A., Vyacheslav E. Saraev, Ekaterina A. Gura, Sergey M. Desenko та Vladimir I. Musatov. "Some Aspects of Reaction of 6-Aminouracil and 6-Amino-2-Thiouracil with α,β-Unsaturated Ketones". Collection of Czechoslovak Chemical Communications 70, № 3 (2005): 350–60. http://dx.doi.org/10.1135/cccc20050350.

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A number of 5,7-diaryl-5,8-dihydropyrido[2,3-d]pyrimidines and 5,7-diarylpyrido[2,3-d]- pyrimidines were obtained by the reaction of 6-aminouracil derivatives with α,β-unsaturated ketones. Basic catalysts decrease yields of the dihydro derivatives whereas acids increase it. In the reactions of ketones containing the dimethylamino group, elimination of the aryl substituent from position 5 of the pyridopyrimidine system was observed. Some aspects of oxidation of 5,8-dihydropyrido[2,3-d]pyrimidines and synthesis of pyrido[2,3-d]pyrimidines were also investigated.
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Wilding, Birgit, Stefan Faschauner, and Norbert Klempier. "A practical synthesis of 5-functionalized thieno[2,3-d]pyrimidines." Tetrahedron Letters 56, no. 30 (2015): 4486–89. http://dx.doi.org/10.1016/j.tetlet.2015.05.104.

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Gein, V. L., A. N. Prudnikova, A. A. Kurbatova, and M. V. Dmitriev. "Synthesis of (E)-5-Arylvinyl-7-methyltetrazolo[1,5-a]pyrimidines." Russian Journal of General Chemistry 91, no. 4 (2021): 621–25. http://dx.doi.org/10.1134/s1070363221040071.

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Abstract A three-component reaction of 5-aminotetrazole with aromatic aldehydes and acetylacetone under solvent- and catalyst-free conditions at a temperature of 150–160°С proceeds with the formation of (E)-5-arylvinyl-7-methyltetrazolo[1,5-a]pyrimidines. 5,7-Dimethyltetrazolo[1,5-a]pyrimidine is formed as a side-product of the reaction.
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Kundu, Nitya G., Biswajit Das, and Anjali Majumdar. "Synthesis of 2,4-Dimethoxy-5-(3-oxo-1-alkynyl)pyrimidines, 2,4-Dimethoxy-5-(3-oxoalkyl)pyrimidines, and 5-(3-Oxoalkyl)uracils by a Highly Convenient Procedure." Synthesis 1990, no. 03 (1990): 243–45. http://dx.doi.org/10.1055/s-1990-26843.

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8

Massari, Serena, Jenny Desantis, Giulio Nannetti, et al. "Efficient and regioselective one-step synthesis of 7-aryl-5-methyl- and 5-aryl-7-methyl-2-amino-[1,2,4]triazolo[1,5-a]pyrimidine derivatives." Organic & Biomolecular Chemistry 15, no. 37 (2017): 7944–55. http://dx.doi.org/10.1039/c7ob02085f.

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Kokorekin, Vladimir A., Sergey V. Neverov, Vera N. Kuzina, and Vladimir A. Petrosyan. "A New Method for the Synthesis of 3-Thiocyanatopyrazolo[1,5-a]pyrimidines." Molecules 25, no. 18 (2020): 4169. http://dx.doi.org/10.3390/molecules25184169.

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In this article, we demonstrate how an original effective “metal-free” and “chromatography-free” route for the synthesis of 3-thiocyanatopyrazolo[1,5-a]pyrimidines has been developed. It is based on electrooxidative (anodic) C–H thiocyanation of 5-aminopyrazoles by thiocyanate ion leading to 4-thiocyanato-5-aminopyrazoles (stage 1, yields up to 87%) following by their chemical condensation with 1,3-dicarbonyl compounds or their derivatives (stage 2, yields up to 96%). This method is equally effective for the synthesis of 3-thiocyanatopyrazolo[1,5-a]pyrimidines, both without substituents and wi
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Nerkar, A. G., S. A. Ghone, and A. K. Thaker. "In SilicoScreening of the Library of Pyrimidine Derivatives as Thymidylate Synthase Inhibitors for Anticancer Activity." E-Journal of Chemistry 6, no. 3 (2009): 665–72. http://dx.doi.org/10.1155/2009/352717.

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We here report the virtual screening of several series of pyrimidine derivatives forin silicoThymidylate Synthase (TS) inhibition to arrive at possible potential inhibitors of TS with acceptable pharmacokinetic or ADME (Absorption, Distribution, Metabolism and Excretion) properties. Library of the molecules was constructed based upon structural modifications of pyrimidines nucleus. Structural modifications in descending order were performed for the series of pyrimidines,vizfrom pyrimidines with five membered heterocyclic ring to pyrimidines with four membered heterocyclic ring to simple pyrimi
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Dissertations / Theses on the topic "5-a]pyrimidines"

1

Rosales, Pauline Fagundes. "Bi-heterociclos a partir do Ácido Levulínico: Síntese de 5-[(5-(trifluormetil)-5-hidroxi-(3-substituido)-4,5-diidro-1H-pirazol-1-il)-1-propan-1-ona-3-il]-2-metil-7-trifluormetil)pirazolo[1,5-a]pirimidinas." Universidade Federal de Santa Maria, 2013. http://repositorio.ufsm.br/handle/1/10535.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>An efficient method to obtain 2-methyl-5-(methylpropanoate-3-yl)-7-trifluoromethylpyrazolo[1,5-a]pyrimidine 2 from the reaction of compound methyl 7,7,7-trifluoro-4-methoxy-6-oxo-heptenoate with 3-amino-5-methyl-1H-pyrazol. This compound 2 brought to reaction with hydrazine monohydrate to obtain 2-methyl-7-trifluoromethylpyrazolo[1,5-a]pyrimidine-5-propanehydrazine 3 and after were later brought to cyclocondensation reaction with a series of β-alkoxyvinyltrifluoromethyl ketones giving the series of news bi-heterocyclic 5-[(5-(trifl
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2

Bassoude, Ibtissam. "Synthèse de nouveaux dérivés pyrazolo[1,5-a]pyrimidiniques à visée biologique." Phd thesis, Université d'Orléans, 2012. http://tel.archives-ouvertes.fr/tel-00789954.

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Nos travaux de thèse portent sur la mise au point de nouvelles méthodes de synthèse permettant l'accès de façon rapide et efficace à différents dérivés pyrazolo[1,5-a]pyrimidiniques diversement fonctionnalisés.La première partie de ce travail concerne l'étude et l'application de la condensation de la pyran-2-one avec les 5(3)-amino-3(5)-arylpyrazoles que ce soit par chauffage classique ou sous irradiation micro-onde. Par la suite, un nouveau procédé d'(hétéro)arylation pallado-catalysé direct régiosélectif a été mis à profit pour élaborer des pyrazolo[1,5-a]pyrimidines fonctionnalisées tant en
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Ear, Po Hien. "Development of a binary positive and negative protein fragment complementation assay using yeast cytosine deaminase." Thèse, 2005. http://hdl.handle.net/1866/15205.

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Book chapters on the topic "5-a]pyrimidines"

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White, Perrin C. "Genes and Hormones." In Textbook of Endocrine Physiology. Oxford University Press, 2011. http://dx.doi.org/10.1093/oso/9780199744121.003.0005.

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Much of the knowledge presented in the following chapters has been gained using molecular genetic techniques to analyze the structure, synthesis, regulation, and effects of hormones. This chapter provides an overview of some of the relevant techniques and associated concepts. To allow the reader to understand older experiments, we have tried to include techniques that are now of mainly historical interest as well as current concepts. Deoxyribonucleic acid (DNA) and ribonucleic acid (RNA) consist of nucleotides . A nucleotide consists of a base , a sugar moiety (either deoxyribose or ribose), and a phosphate group. The sugars and phosphates alternate in the backbone of a nucleic acid strand. In general, there are four possible bases. In DNA, these are adenine ( A ), cytosine ( C ), guanine ( G ), and thymine ( T ). Adenine and guanine are purines , whereas cytosine and thymine are pyrimidines . The corresponding nucleotides are adenosine , cytidine , guanosine , and thymidine. In RNA, uracil (uridine) is substituted for thymine (thymidine). DNA is double stranded. Each strand has a direction because the deoxyribose molecules forming the backbone are asymmetrical, with the phosphate bonds linking each two sugar molecules going from the 3’ position of one to the 5’ position of the next. Thus, the 5’ position of a sugar molecule is free at one end (the 5’ end) of the strand, and the 3’ position is free at the other. The two strands of a DNA molecule run in opposite directions, so that the 5’ end of one strand is opposed to the 3’ end of the complementary strand. The DNA strands interact with each other through complementary (Watson-Crick) base pairing , in which A and T, or C and G, are paired through hydrogen bonds. Thus, the sequence of one DNA strand unambiguously determines the sequence of the complementary strand during DNA replication. The length of a DNA segment is typically given in bases or nucleotides (nt) or, if double stranded, base pairs (bp).
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Hermecz, István. "Chemistry of Benzologs of Pyrido[1,2-a]pyrimidines: Part V of Series on Pyrido-oxazines, -diazines, and -thiazines." In Advances in Heterocyclic Chemistry Volume 73. Elsevier, 1999. http://dx.doi.org/10.1016/s0065-2725(08)60943-5.

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Conference papers on the topic "5-a]pyrimidines"

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Shkineva, Tatyana, Irina Vatsadze, and Igor Dalinger. "5-AMINO-3,4-DINITROPURAZOLE – A KEY SYNTHON FOR OBTAINING FUNCTIONALLY SUBSTITUTED PYRAZOLO[1,5-a]PYRIMIDINES." In Chemistry of nitro compounds and related nitrogen-oxygen systems. LLC MAKS Press, 2019. http://dx.doi.org/10.29003/m782.aks-2019/313-315.

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Scapin, Elisandra, Lilian Buriol, Clarissa Piccinin Frizzo, and Marcos A. P. Martins. "Synthesis of 7-trifluo[trichlo]romethyl-5-aryl[alkyl]-tetrazolo[1,5-a] pyrimidines in Ionic Liquid." In 15th Brazilian Meeting on Organic Synthesis. Editora Edgard Blücher, 2013. http://dx.doi.org/10.5151/chempro-15bmos-bmos2013_2013819155310.

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You might also be interested in the extended bibliographies on the topic '5-a]pyrimidines' for particular source types:
Journal articles
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