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Synthesis of 1,6-naphthyridin-4-one derivatives. (a) 0.5 mmol of 1-(4-amino-2-chloropyridin-3-yl)-2-substituted-ethan-1-one (17) and 0.05 mmol of DMAP in 1.0 mL triethyl orthoformate (13a–n) or triethyl orthoacetate (13o) at 110 °C for 24 h; (b) Isolated yield.
