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 1,8-Naphthyridines. I. Derivatives of 2- and 4-methyl-1,8-naphthyridines, published in 1965, which mentions a compound: 1569-17-1, Name is 4-Methyl-1,8-naphthyridine, Molecular C9H8N2, Related Products of 1569-17-1.
2-Methyl-1,8-naphthyridine has been prepared by a series of reactions starting with 2-methyl-5-hydroxy-1,8-naphthyridine-6-carboxylic acid and compared with the known 4-methyl-1,8-naphthyridine. The compound previously thought to be 2-methyl-4-hydroxy-7-amino-l,8-naphthyridine has been shown to be 2-hydroxy-4-methyl-7-amino-1,8-naphthyridine by conversion to 4-methyl-1,8-naphthyridine. A new ring closure has furnished 2-methyl-7-amino-1,8-naphthyridine and, in addition, 2-amino-5-methyl-1,8-naphthyridine and 2-methyl-5-amino-1,8-naphthyridine have been prepared by other means.
If you want to learn more about this compound(4-Methyl-1,8-naphthyridine)Related Products of 1569-17-1, you may wish to communicate with the author of the article,or consult the relevant literature related to this compound(1569-17-1).
Reference:
1,8-Naphthyridine – Wikipedia,
1,8-Naphthyridine | C8H6N2 – PubChem