Piperazine is an organic compound consisting of a six-membered ring containing two nitrogen atoms in opposite positions in the ring. The chemical formula of piperazine is C4H10N2, and it is an important pharmaceutical intermediate. Pyrimidines and piperazines are known to be the backbone of many bulk compounds and important core structures for approved drugs; studies have shown that combining a pyridine ring with a piperazine moiety within a single structural framework enhances biological activity.
Incorporation of heterocycles into drug molecules can enhance physical properties and biological activity. Oxadiazoles are a class of five-membered heterocycles containing one oxygen and two nitrogen atoms with special biological activity and thermodynamic properties. 1,2,4- and 1,3,4-oxadiazoles are widely used in the development of bioactive molecules, but 1,2,5-oxadiazoles (furazans) are used relatively sparingly. Compared with 1,2,4- and 1,3,4-isomers, 1,2,5-oxadiazole has unique physicochemical properties and electronic effects. The furazan ring has a strong inductive effect, comparable to that of trifluoromethyl or tetrazolyl. The unique properties of furoxan can confer specific pharmacological activities to drug-like molecules.
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