Hamada, Yoshiki published the artcileNitrogen-containing heterocyclic compounds. XXI. Syntheses of naphthyridines by improved one step process, Recommanded Product: 2,7-Dimethyl-1,8-naphthyridine, the publication is Yakugaku Zasshi (1974), 94(10), 1328-34, database is CAplus and MEDLINE.
Methyl-1,5-naphthyridines and methyl-1,6-naphthyridines were prepared by treating crotonaldehyde, methacrolein, or Me vinyl ketone with 3- and 4-aminopyridines in the presence of sulfo-mix, FeSO4, and H3BO3. 3-Chloro-, 3-bromo-, and 2,4-dimethyl-1,8-naphthyridines were prepared by treating glycerol with 5-chloro-, 5-bromo-, and 4,6-dimethyl-2-aminopyridines in the presence of m-O2NC6H4SO3Na, FeSO4, and H3BO3. The Hays method was also applied to 4-methyl-, 5-methyl-, 6-methyl-, and 4,6-dimethyl-2-aminopyridine, and dimethyland trimethyl-1,8-naphthyridines were obtained in a high yield. Some dimethyl- and trimethyl-1,8-naphthyridines had strong herbicidal activity.
Yakugaku Zasshi published new progress about 14903-78-7. 14903-78-7 belongs to naphthyridine, auxiliary class 6.6_Aromatics,Naphthyridines, name is 2,7-Dimethyl-1,8-naphthyridine, and the molecular formula is C10H10N2, Recommanded Product: 2,7-Dimethyl-1,8-naphthyridine.
Referemce:
https://en.wikipedia.org/wiki/1,8-Naphthyridine,
1,8-Naphthyridine | C8H6N2 – PubChem