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 new 2-chloro-5-fluoro-6-[(4-phenylmethyl)piperazinyl]-4-trifluoromethyl-3-nicotinic acid, published in 1993-03-01, which mentions a compound: 52208-50-1, Name is 2,6-Dichloro-3-fluoropyridine, Molecular C5H2Cl2FN, Electric Literature of C5H2Cl2FN.
The nicotinic acid (I), which could be a key intermediate for novel potential antibacterial 1,8-naphthyridine-3-carboxylic acid analogs, was prepared starting with construction of the pyridine nucleus of II by Et 2-fluoroacetate and Et 2-trifluoroacetate.
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Reference:
Pyrroline – Wikipedia,
1-Pyrroline | C4H7N – PubChem