Synthesis, spectroscopic studies and the mechanism of formation of 4,5-dihydro-1,2,4-oxadiazoles
作者:Rajendra M. Srivastava、Maria V. S. Freire、AngeloS. S. C. Chaves、Thereza M. Beltrão、Gene B. Carpenter
DOI:10.1002/jhet.5570240121
日期:1987.1
and aromatic aldehydes. None of these compounds were encountered in the literature. The ultraviolet, infrared and proton magnetic resonance spectral studies supported the cyclic structure. Structure determination of a chloral-benzamidoxime adduct, 15, by X-ray crystallography helped us to suggest the mechanism of formation of 4,5-dihydro-1,2,4-oxadiazole from benzamidoxime and an aldehyde. Substances
通过苯甲酰胺肟1a-i与脂族和芳族醛的反应合成了九种4,5-二氢-1,2,4-恶二唑2a-i。在文献中没有遇到这些化合物。紫外,红外和质子磁共振光谱研究支持了循环结构。通过X射线晶体学确定氯代-苯甲酰胺肟加合物15的结构,有助于我们提出由苯甲酰胺肟和醛形成4,5-二氢-1,2,4-恶二唑的机理。物质2a,b,d,e,g,h表现出一定的抗真菌性神经孢霉(Neurospora crassa)活性。化合物2e在耻垢分枝杆菌中也表现出生长抑制作用。