反应详情

To a suspension of 6-hydroxy-5H-benzo[a]phenothiazine-5-one-7,7-dioxide (430 mg) in water (10 cc) and ethyl acetate (10 ml) there was added sodium dithionite (1 g). The suspension was stirred vigorously at room temperature for 2 hours, then the insolubles were filtered and washed with water and ethyl acetate. There was obtained 346 mg of the title compound, m.p. 330° C.

1. filtrationthe insolubles were filtered
2. washwashed with water and ethyl acetate