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 Preparation of γ-butyrolactones by the oxidation of monofunctional derivatives of tetrahydrofuran, published in 1972, which mentions a compound: 37443-42-8, Name is Methyl tetrahydrofuran-2-carboxylate, Molecular C6H10O3, Name: Methyl tetrahydrofuran-2-carboxylate.
Liquid phase oxidation of tetrahydrofurfuryl alc., its formate and acetate, and Me 2-tetrahydrofurancarboxylate, largely at 115°, in 10-25 hr in a flow-type glass reactor gave good yields of γ-butyrolactone or its γ-CH2OH, CH2O2CH, CH2OAc or CO2Me derivatives, resp., HCO2H and succinic acid. Evidently the oxidation occurred at the C2 and C5 positions. Uv light promoted the reaction and allowed its operation at lower temperature The summary yields of the lactones were 72-95%. The last substrate above was oxidized in the presence of Mn(OAc)2.4H2O catalyst at 70°.
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Reference:
Benzisoxazole – Wikipedia,
Benzisoxazole – an overview | ScienceDirect Topics