m-Chloroperbenzoic acid → 5-Acetoxy-12H-benzo[a]phenothiazine-7-oxide

Participants

Reaction Steps

To a suspension of 5-acetoxy-12H-benzo[a]phenothiazine (10 g) in dichloromethane (125 cc) there was rapidly added a solution of 85% m-chloroperoxybenzoic acid (6.61 g) in methanol (125 ml). At first the solids dissolved, then after a few minutes a new solid separated out of solution. After 1 and 1/2 hours the mixture was filtered and the solid washed with dichloromethane. The title compound was thus obtained pure (8.76 g), m.p. 179°-181° C.

Provenance & Evidence