Mostrando 61 - 80 Resultados de 4,819 Para Buscar 'Pirimidina~', tiempo de consulta: 5.09s Limitar resultados
  1. 61
    por Li, Zhen-Jiang, Huang, Jun-E, Meng, A-Lan
    Publicado 2008
    “…The title compound, C(11)H(11)N(3), was synthesized as part of our research into functionalized pyrimidines. It crystallizes with two independent mol­ecules in the asymmetric unit that differ only in the twist between the two aromatic rings; the torsion angles between the rings are 29.9 (2) and 45.1 (2)°. …”
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  7. 67
    “…In the title compound, C(11)H(10)N(2)O(2), the benzene ring faces towards one of the pyrimidine N atoms, and is almost orthogonal to the plane through the pyrimidine ring [dihedral angle = 84.40 (14)°]. …”
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  8. 68
    “…In the title mol­ecule, C(5)H(6)BrN(3), the pyrimidine ring is essentially planar, with an r.m.s. deviation of 0.007 Å. …”
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  12. 72
    “…In the title compound, C(4)H(3)BrClN(3), the pyrimidine ring is essentially planar (r.m.s. deviation from the plane = 0.087 Å). …”
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  13. 73
    “…It was found that the outcome of the reaction strongly depends on the structure of the pyrimidines. Activation of the pyrimidine ring by three groups with a positive mesomeric effect is crucial for the intramolecular nitroso group migration.…”
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  14. 74
    “…Thiophene substituted chalcones (1a-e) were cyclised with thiourea in presence of potassium hydroxide to get 4-substituted-6-(thiophen-2-yl)pyrimidine-2-thiols (2a-e) which were then stirred with methyl iodide to obtain 4-substituted-2-(methylsulfanyl)-6-(thiophen-2-yl)pyrimidines (3a-e). …”
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  15. 75
  16. 76
    “…Thus, a full set of ribonucleosides to generate the purine–pyrimidine base pairs A-U and I-C are spontaneously generated in aqueous microdroplets under similar mild conditions.…”
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  17. 77
    “…Three series of new pyrimidine derivatives were synthesized and their antifungal activities were evaluated in vitro against fourteen phytopathogenic fungi. …”
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  18. 78
  19. 79
    por Kim, Hyo-Joong, Kim, Justin
    Publicado 2019
    “…Here, we report that the glycosidic bond in canonical pyrimidine and purine ribonucleotides can be formed by direct coupling of cyclic carbohydrate phosphates with free nucleobases, all reported to be available by experimentally supported pathways that might have operated on early Earth.…”
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  20. 80
    “…A series of pyrimidine derivatives bearing one, two or three triphenylamine/9-ethylcarbazole substituents has been synthesized by Suzuki cross-coupling reaction. …”
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