反应详情

To a 250-ml round bottom flask was added a stir bar, 6.8-dihydro-1-thia-3,6-diaza-as-indacen-7-one (4.0 g, 0.021 mol), 40 mL of glacial acetic and diethoxymethyl acetate (17.0 g, 0.105 moles). The flask was fitted with a reflux condensor and charged with nitrogen. The reaction was heated to reflux for 8 h. The flask was cooled, the stir bar was removed and the reaction was concentrated to a wet solid. The solid was triturated with a solution of ether and ethanol. The mixture was filtered, the solid was washed with an ethanol-ether solution, and the solid was dried under vacuum to yield 8-ethoxymethylene-6,8-dihydro-1-thia-3,6-diaza-as-indacen-7-one: 1H NMR (DMSO-d6): δ10.5 (s, 1H), 9.1 (s, 1H), 7.8 (d, 1H), 7.7 (s, 1H), 7.0 (d, 1H), 4.5 (q, 2H), 1.4 (t, 3H); APCI−MS m/z 245 (M−H)−.

1. additionTo a 250-ml round bottom flask was added a stir bar
2. customThe flask was fitted with a reflux condensor
3. additioncharged with nitrogen
4. temperatureThe reaction was heated
5. temperatureto reflux for 8 h
6. temperatureThe flask was cooled
7. customthe stir bar was removed
8. concentrationthe reaction was concentrated to a wet solid
9. customThe solid was triturated with a solution of ether and ethanol
10. filtrationThe mixture was filtered
11. washthe solid was washed with an ethanol-ether solution
12. customthe solid was dried under vacuum