反应详情

E-7b. 5-Methyl-1,6-naphthyridin-2(1H)-one--A mixture containing 10.3 g of 5-acetyl-6-(2-dimethylaminoethenyl)-2(1H)-pyridinone, 10.4 g of formamidine acetate and 75 ml of dimethylformamide was heated on a steam bath for 5 hours and then concentrated to dryness on a rotary evaporator. The residue was treated with 50 ml of water and again stripped to dryness The white residue was recrystallized from isopropyl alcohol to yield 6.7 g of 5-methyl-1,6-naphthyridin-2(1H)-one, m.p. 238°-240° C. This compound was the same as the compound of Example E-7a, e.g., a mixed melting point showed no depression and the infrared and nuclear magnetic resonance spectral data for the compounds were respectively the same.

1. temperaturewas heated on a steam bath for 5 hours
2. concentrationconcentrated to dryness on a rotary evaporator
3. additionThe residue was treated with 50 ml of water
4. customwas recrystallized from isopropyl alcohol