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 Tin Powder-Promoted Cascade Condensation/Allylation/Lactamization: Synthesis of Isoindolinones and Pyrazoloisoindol-8-ones, published in 2019-06-07, which mentions a compound: 3326-71-4, Name is 2-Furoic hydrazide, Molecular C5H6N2O2, Category: benzisoxazole.
An efficient tin powder-promoted cascade condensation/allylation/lactamization of 2-formylbenzoic acids, hydrazides, and allyl bromides was developed for the synthesis of isoindolinones in good to excellent yields under mild conditions without any other additives or catalysts. Further manipulation of isoindolinones by iodocyclization process afforded the tricyclic tetrahydro-8H-pyrazolo[5,1-a]isoindol-8-one derivatives, which could be converted into more complicated tetracyclic tetrahydro-4H-azirino[1′,2′:2,3]pyrazolo[5,1-a]isoindol-4-ones.
In some applications, this compound(3326-71-4)Category: benzisoxazole is unique.If you want to know more details about this compound, you can contact with the author or consult more relevant literature.
Reference:
Benzisoxazole – Wikipedia,
Benzisoxazole – an overview | ScienceDirect Topics