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 Vicarious nucleophilic substitution of hydrogen, bisannulation and competitive reactions of α-haloalkyl carbanions with bicyclic azaaromatic compounds, published in 1991-03-31, which mentions a compound: 1569-17-1, Name is 4-Methyl-1,8-naphthyridine, Molecular C9H8N2, Electric Literature of C9H8N2.
Carbanions of RR1CHSO2R2 (I; R = Cl, R1 = H, Me, R2 = NMe2, Ph, CMe3, morpholino, tolyl; R = Br, R1 = H, R2 = tolyl) react with bicyclic heteroaromatic compounds (quinoxalines, naphthyridines, and 5-azaquinoxalines) according to 2 general pathways: vicarious nucleophilic substitution (VNS) of hydrogen and/or bisannulation. In some cases other competitive reactions are observed Factors governing the direction of these reactions are discussed in terms of the charge distribution in the anionic σ adducts and the reaction conditions. For example reaction of quinoxaline and quinoxaline N-oxide with I (R = Cl, R1 = H, R2 = Ph) gave bisazirinoquinoxaline II and VNS product III resp.
In some applications, this compound(1569-17-1)Electric Literature of C9H8N2 is unique.If you want to know more details about this compound, you can contact with the author or consult more relevant literature.
Reference:
1,8-Naphthyridine – Wikipedia,
1,8-Naphthyridine | C8H6N2 – PubChem