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 3-(5-X-2-Furyl)-2-cyanoacrylonitriles on reaction with 2-cyanomethylbenzothiazole, published in 1991-02-28, which mentions a compound: 2689-65-8, Name is 5-Iodo-2-furaldehyde, Molecular C5H3IO2, Product Details of 2689-65-8.
2-Cyanomethylbenzothiazole reacts with 3-(5-substituted 2-furyl)-, 3-(2-thienyl)- or 3-(2-pyrrolyl)-2-cyanoacrylonitrile in THF under catalysis of triethylamine to give 1-(2-benzothiazolyl)-1-acyano-2-heteroarylethylenes e.g. I (R = H, X = O, S, NH; R = Br, Me, NO2, X = O) as a result of replacement of malonodinitrile by 2-cyanomethylbenzothiazole.
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Reference:
1,8-Naphthyridine – Wikipedia,
1,8-Naphthyridine | C8H6N2 – PubChem