In general, if the atoms that make up the ring contain heteroatoms, such rings become heterocycles, and organic compounds containing heterocycles are called heterocyclic compounds. An article called Direct Catalytic Symmetrical, Unsymmetrical N,N-Dialkylation and Cyclization of Acylhydrazides Using Alcohols, published in 2020-08-21, which mentions a compound: 3326-71-4, Name is 2-Furoic hydrazide, Molecular C5H6N2O2, Synthetic Route of C5H6N2O2.
Herein, direct N,N-dialkylation of acylhydrazides using alcs. is reported. This catalytic protocol provides one-pot synthesis of both sym. and unsym. N,N-disubstituted acylhydrazides using an assortment of primary and secondary alcs. with remarkable selectivity and excellent yields. Interestingly, the use of diols resulted in intermol. cyclization of acylhydrazides, and such products are privileged structures in biol. active compounds Water is the only byproduct, which makes this catalytic protocol sustainable and environmentally benign.
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Reference:
Benzisoxazole – Wikipedia,
Benzisoxazole – an overview | ScienceDirect Topics