Most of the compounds have physiologically active properties, and their biological properties are often attributed to the heteroatoms contained in their molecules, and most of these heteroatoms also appear in cyclic structures. A Journal, European Journal of Organic Chemistry called Electrochemical Synthesis of 2,5-Disubstituted 1,3,4-Oxadiazoles from α-Keto Acids and Acylhydrazines Under Mild Conditions, Author is Lu, Fangling; Gong, Fengping; Li, Liangsen; Zhang, Kan; Li, Zhen; Zhang, Xinwei; Yin, Ying; Wang, Ying; Gao, Ziwei; Zhang, Heng; Lei, Aiwen, which mentions a compound: 3326-71-4, SMILESS is O=C(C1=CC=CO1)NN, Molecular C5H6N2O2, Formula: C5H6N2O2.
1,3,4-Oxadiazoles are a kind of useful heterocycles which can be frequently found in materials and bioactive mols. In this study, intermol. electrochem. cyclization between α-keto acids and acylhydrazines has been developed for the synthesis of 2,5-disubstituted 1,3,4-oxadiazoles with the yield up to 91% [e.g., benzohydrazide + 2-oxo-2-phenylacetic acid → 2,5-diphenyl-1,3,4-oxadiazole (90%)]. This transformation can be run under mild reaction conditions in the absence of external oxidant, base and transition metal catalyst. Both sym. and unsym. 2,5-disubstituted 1,3,4-oxadiazoles could be prepared according to the careful choice of the substrate combination. Gram scale synthesis also illustrates the potential application of this protocol in large preparation
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Reference:
Benzisoxazole – Wikipedia,
Benzisoxazole – an overview | ScienceDirect Topics