Sodium Iodide → (3RS)-1,3-dihydro-5-phenyl-3-phthalimido-2H-1,4-benzodiazepine-2-one

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A mixture of (3RS)-1,3-dihydro-3-acetoxy-5-phenyl-2H-1,4-benzodiazepine-2-one (11.75 g), potassium phthalimide (11.1 g), sodium iodide (60 g) and N,N-dimethylformamide (80 ml) was stirred for 45 minutes at 90° to 95° C. The reaction mixture was poured into a cold water (1 l). The precipitates were collected by filtration, washed with water and recrystallized from ethanol to give (3RS)-1,3-dihydro-5-phenyl-3-phthalimido-2H-1,4-benzodiazepine-2-one (8.32 g).

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