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 Aryl and heteroaryl indium(III) reagents by the direct insertion of indium in the presence of LiCl, published in 2008, which mentions a compound: 2689-65-8, Name is 5-Iodo-2-furaldehyde, Molecular C5H3IO2, Application of 2689-65-8.
Sensitive functional groups, including ketone, aldehyde, and ester groups, may be present in aryl In reagents prepared in good to excellent yields by the treatment of aryl and heteroaryl iodides with In powder in the presence of LiCl. These functionalized organoindium(III) reagents readily undergo Pd-catalyzed cross-coupling with functionalized aryl iodides, including those containing NH or OH groups.
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Reference:
1,8-Naphthyridine – Wikipedia,
1,8-Naphthyridine | C8H6N2 – PubChem