反应详情

温度

0 °C

2-(4-methoxy-benzyl)-3,4-dihydro-2H-[2,7]naphtyridine-1-on (1.63 g, 6.075 mmol) was suspended in 30 mL of anhydrous toluene, added with p-toluene sulfonic acid monohydrate (4.62 g, 24.30 mmol) and heated to reflux for about 6 hours under the nitrogen atmosphere. The mixture, while being stirred at 0° C., neutralized by adding a saturated solution of sodium carbonate and extracted seven times with 150 mL of 15% MeOH/MC. The resulting organic layer was dried with anhydrous sodium sulfate, filtered and then concentrated. A silica gel column chromatography (7% MeOH/MC) was performed on the resulting residue an dobtained 550 mg (61%) of 3,4-dihydro-2H-[2,7]naphtyridine-1-on in white solid.

1. temperatureheated
2. temperatureto reflux for about 6 hours under the nitrogen atmosphere
3. extractionextracted seven times with 150 mL of 15% MeOH/MC
4. dry with materialThe resulting organic layer was dried with anhydrous sodium sulfate
5. filtrationfiltered
6. concentrationconcentrated