反应详情

温度

30 °C

A mixture of 7-(3-tert-Butoxycarbonyl-phenyl)-5,6,7,8-tetrahydro-[2,7]naphthyridine-4-carboxylic acid methyl ester (6.9 g, 0.0188 mol) and 98% formic acid (30 mL) was heated at 50° C. for 4 hr and at 30° C. overnight. HPLC analysis showed the reaction was not complete. It was heated at 50° C. for an additional 1.5 hr. The reaction mixture was concentrated under reduced pressure. Diluted with dichloromethane (200 mL) and cooled to 0° C. To the mixture (liquid and solid) was added saturated sodium bicarbonate until to get a pH=5-6 at 0° C. The solid was collected, washed with water (50 mL), dichloromethane (50 mL) and air dried. The solid was triturated with acetone (50 mL) for 30 min. The yellow-green solid was collected and dried in a drying pistol with refluxing acetone overnight to give the title compound (3.86 g, 66%). 1H NMR 300 MHz (d6-DMSO), δ 13 (brs, 1H), 8.8 (s, 1H), 8.65 (s, 1H), 7.5 (m, 4H), 4.5 (s, 2H), 3.8 (s, 3H), 3.6 (t, 2H), 3.2 (t, 2H).

1. temperatureIt was heated at 50° C. for an additional 1.5 hr
2. concentrationThe reaction mixture was concentrated under reduced pressure
3. additionDiluted with dichloromethane (200 mL)
4. temperaturecooled to 0° C
5. additionTo the mixture (liquid and solid) was added saturated sodium bicarbonate until
6. customto get a pH=5-6 at 0° C
7. customThe solid was collected
8. washwashed with water (50 mL), dichloromethane (50 mL) and air
9. customdried
10. customThe solid was triturated with acetone (50 mL) for 30 min
11. customThe yellow-green solid was collected
12. dry with materialdried in a drying pistol with refluxing acetone overnight