Benzaldehyde → 1,2-Dimethyl-10-(3-benzylaminopropyl)-phenothiazine-5-oxide

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Reaction Steps

A solution of 1.5 g of 1,2-dimethyl-10-(3-aminopropyl)phenothiazine-5-oxide obtained in Example 8 and 580 mg of benzaldehyde in 60 ml of toluene was stirred under reflux for 2 hr while using a water separator. Then the mixture was cooled to room temperature and the solvent was evaporated under reduced pressure. After adding 60 ml of ethanol and sodium borohydride successively, the reaction mixture was stirred under ice cooling for 10 min. After adding water, the mixture was extracted with ethyl acetate. The organic layer was washed with brine and dried over anhydrous magnesium sulfate. After evaporating the solvent under reduced pressure, the residue was washed with diethyl ether to give 1.9 g of the title compound.

Provenance & Evidence