反应详情

The product from Step (3) was dissolved in 2N sodium hydroxide (150 ml) and the solution was refluxed for 4 hours. Then the solution was cooled and acidified with mineral acid to pH3. The solid was filtered, dried and crystallized from ethyl acetate/hexane to give 1-benzyl-4-hydroxy-6-methyl-2(1H)-quinolinone (4,0 gm). That the expected product was obtained was confirmed by the spectral data: MS: m/e 265 (M+); NMR (DMSO): δ2.32 (s, 3H, CH3 -Ar), 5.43 (s, 2H, CH2 -Ar), 5.96 (s, 1H, =CH-), 11.48 (s, 1H, OH) ppm.

1. temperaturethe solution was refluxed for 4 hours
2. temperatureThen the solution was cooled
3. filtrationThe solid was filtered
4. customdried
5. customcrystallized from ethyl acetate/hexane