反应详情

温度

78 °C

Ethanol (1500 mL) was added to a mixture of 7-acetyl-4-hydroxy-3H-benzothiazol-2-one (150 g) (WO2004/016578) and benzyltrimethylammonium dichloroiodate (374 g) in a flask fitted with an overhead stirrer. The mixture was heated to 78° C. for 1 h and left to cool to room temperature overnight. The mixture was poured into water (2 L), and the precipitate collected by filtration, washed with water, filtered to near dryness, and suspended in ethyl acetate. The mixture was heated to reflux and allowed to cool to room temperature with stirring. The solid was collected by filtration, washed with cold ethyl acetate (200 mL) then re-suspended in diethyl ether (1 L). The solid was collected, filtered again and washed with ether (200 mL) and dried in vacuo to give the subtitled compound. Yield 164 g.

1. customfitted with an overhead stirrer
2. waitleft
3. temperatureto cool to room temperature overnight
4. filtrationthe precipitate collected by filtration
5. washwashed with water
6. filtrationfiltered
7. temperatureThe mixture was heated
8. temperatureto reflux
9. temperatureto cool to room temperature
10. filtrationThe solid was collected by filtration
11. washwashed with cold ethyl acetate (200 mL)
12. customThe solid was collected
13. filtrationfiltered again
14. washwashed with ether (200 mL)
15. customdried in vacuo