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 Carbon-13 nuclear magnetic resonance spectra of substituted pyridine N-oxides, published in 1979, which mentions a compound: 2402-95-1, Name is 2-Chloropyridine 1-oxide, Molecular C5H4ClNO, Reference of 2-Chloropyridine 1-oxide.
13C NMR spectra of substituted pyridine N-oxides were examined and compared to the spectra of the corresponding free pyridine bases. The N-oxide functionality causes significant shielding at the C-2, C-4, and C-6 positions. This shielding was associated with electron d. donation by the N-oxide functionality to these positions. The N-oxide functionality also caused an enhancement of the substituent α-effect for -NMe2, -OMe, and -NO2 groups.
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Reference:
Isoxazole – Wikipedia,
Isoxazole | C3H3NO – PubChem