How is 2,6-Naphthyridin-1(2H)-one (CAS: 80935-77-9) typically synthesized?

2,6-Naphthyridin-1(2H)-one can be synthesized via the condensation of 2-amino-6-nitrobenzaldehyde with acetic anhydride, followed by reduction of the nitro group. Alternatively, it can be produced by the dehydration of 2,6-diamino-1,3,5-triazine under acidic conditions. These methods yield pure compounds with high selectivity and good to excellent yields.