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 crystal X-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。