A Facile Synthesis of Derivatives of (1,3,4-Thiadiazol-2-yl)glycine and Its Phosphonyl Analogue
作者:Vladimir S. Brovarets、Aleksandr V. Golovchenko、Stepan G. Pilyo、Alexander N. Chernega、Boris S. Drach
DOI:10.1055/s-2003-42458
日期:——
The adducts formed by 4-functionally-substituted 2-aryl-5-hydrazino-1,3-oxazoles and aryl isothiocyanates recyclize on heating to produce the hitherto unknown derivatives of (1,3,4-thiadiazol-2-yl)glycine and its phosphonyl analogue.
Recyclization of Products Formed by Addition of 5-Hydrazino-2-phenyl-1,3-oxazoles Functionally Substituted in 4-Position to Aryl Isothiocyanates
作者:A. V. Golovchenko、S. G. Pil'o、V. S. Brovarets、B. S. Drach
DOI:10.1023/b:rugc.0000018668.00291.da
日期:2003.11
between alternative structures IV and V was based on the results of a single crystalX-ray diffraction study of the product formed by the reaction of Ia with p-tolyl isothiocyanate. This compound was unambiguously identified as the 1,3,4thiadiazole derivative. Possible applications of this recyclization, resembling formation of related 1,3,4oxadiazole derivatives [1, 3], will be considered in subsequent papers
质子平衡 II III 很可能发生,随后的再循环 III IV 显然是由于不稳定的 5-亚氨基-2-恶唑啉衍生物很容易转化为具有明显芳香性的取代的 1,3,4-噻二唑。H NMR光谱与这种特殊反应的最终产物的建议结构一致;然而,替代结构 IV 和 V 之间的最终选择是基于对 Ia 与对甲苯基异硫氰酸酯反应形成的产物的单晶 X 射线衍射研究的结果。该化合物被明确确定为 1,3,4 噻二唑衍生物。这种再循环的可能应用,类似于形成相关的 1,3,4 恶二唑衍生物 [1, 3],将在后续论文中考虑。
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作者:V. S. Brovarets、R. N. Vydzhak、S. G. Pil'o、K. V. Zyuz'、B. S. Drach
DOI:10.1023/a:1013982122431
日期:——
Treatment of 1-phosphorylated 2,2-dichloroethenylcarboxamides with excess hydrazine hydrate gives in high yields phosphorylated derivatives of 2-alkyl(aryl)-5-hydrazinooxazoles containing the P(O)(OCH3)(2), P(O)(OC2H5)(2), and P+(C6H5)3ClO(4)(-) groups in the 4-position of the ring. The presence of the hydrazine group in these oxazole derivatives was confirmed not only by the spectral data, but also by the reactions with p-toluic aldehyde, p-toluic chloride, and phenyl isothiocyanate.
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作者:V. S. Brovarets、S. G. Pil'o、T. P. Popovich、R. N. Vydzhak、B. S. Drach