反应详情

温度

35 °C

Manganese dioxide (530 mg, 6.05 mmol, 5.0 eq) is added at room temperature to a stirred solution of 4-hydroxymethyl-6-methoxy-[1,5]naphthyridin-3-ol (250 mg, 1.21 mmol, 1.0 eq) in acetonitrile (10 mL) and the resulting mixture is stirred at 35° C. for 1 hour. The solid is filtered off, washed with acetone (3×10 mL) and the filtrate is concentrated to give a residue that is purified by column chromatography (silica gel, eluent: petroleum ether:ethyl acetate, 1:4, v/v) to afford 3-hydroxy-6-methoxy-[1,5]naphthyridine-4-carbaldehyde as a light yellow solid (180 mg, 73% yield).

1. filtrationThe solid is filtered off
2. washwashed with acetone (3×10 mL)
3. concentrationthe filtrate is concentrated
4. customto give a residue that
5. customis purified by column chromatography (silica gel, eluent: petroleum ether:ethyl acetate, 1:4, v/v)