反应详情

Acetic anhydride (2 ml) was added to a solution of 5-hydroxy-12H-benzo[a]phenothiazine (1) (1.4 gm) in pyridine (10 ml) and stirred for 15 minutes. The reaction mixture was concentrated under vacuum and ice-water was added to the residue. The resulting precipitate was filtered, air-dried and washed with ethyl acetate to afford the title compound.

1. concentrationThe reaction mixture was concentrated under vacuum and ice-water
2. additionwas added to the residue
3. filtrationThe resulting precipitate was filtered
4. customair-dried
5. washwashed with ethyl acetate