Kaigorodova, E.A.; Kvak, S. N.; Ugrak, B. I.; Zaplishnyi, V. N.; Kul’nevich, V. G. published the article 《Studies on furopyridines. VI. Synthesis and stereostructure of hetarylmethylene-3-oxo-4-thiofuro[3,4-c]pyridines》. Keywords: furopyridine thio hetarylmethylene preparation stereochem; regioselective condensation heteroaromatic aldehyde thiofuropyridine.They researched the compound: 5-Iodo-2-furaldehyde( cas:2689-65-8 ).COA of Formula: C5H3IO2. Aromatic heterocyclic compounds can be divided into two categories: single heterocyclic and fused heterocyclic. In addition, there is a lot of other information about this compound (cas:2689-65-8) here.
Condensation reaction of 6-methyl-3-oxo-4-thio-1H-furo[3,4-c]pyridine with heteroaromatic aldehydes proceeds regioselectively at the methylene center to give Z isomers of title compounds I (R = H, Z = O, S; R = Me, Br, iodo, Z = O) in s-cis conformations for furfuryl and in s-trans conformations for thenylmethylene derivatives
There are many compounds similar to this compound(2689-65-8)COA of Formula: C5H3IO2. if you want to know more, you can check out my other articles. I hope it will help you，maybe you’ll find some useful information.
Reference:
1,8-Naphthyridine – Wikipedia,
1,8-Naphthyridine | C8H6N2 – PubChem