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 N-Oxides of nicotinic acid and its esters, published in 1949, which mentions a compound: 455-70-9, Name is Methyl 5-fluoro-3-pyridinecarboxylate, Molecular C7H6FNO2, Application In Synthesis of Methyl 5-fluoro-3-pyridinecarboxylate.
Nicotinic acid (I) (1 part) in 3 parts glacial AcOH and 3 parts H2O2, heated 3 hrs. on the water bath, gives 70-80% of the N-oxide (II), pale yellow, m. 249° (decomposition); impure II, heated at 100°, decompose spontaneously. II (1 g.) in 20 ml. MeOH, saturated with HCl at 0° and refluxed 2 hrs., gives 0.5 g. of the Me ester, m. 97°; Et ester (III), m. 99.5°. The Et ester of I (2 g.), 10 ml. AcOH, and 30 ml. H2O2, heated 3 hrs. on the water bath, give 1.1 g. III.
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Reference:
1,3-Benzodioxole – Wikipedia,
Dioxole | C3H4O2 – PubChem