反应详情

A round-bottomed flask was charged with 7-bromo-5-(2-fluorophenyl)-1,3-dihydro-2H-1,4-benzodiazepin-2-one (500 mg) and tetrahydrofuran (20 mL). To this mixture was added lithium aluminum hydride (1.8 mL of 1M solution in tetrahydrofuran). The reaction was stirred overnight at room temperature, then quenched with water and 10% sodium hydroxide. The quenched mixture was filtered through Celite and the filter was washed with ethyl acetate. The filtrate was dried over magnesium sulfate, filtered and concentrated to an oil. Silica gel purification provided 7-bromo-5-(2-fluorophenyl)-2,3-dihydro-1H-1,4-benzodiazepine (250 mg) as a yellow powder. H1 NMR (d6-dmso): 7.43-7.50 (m, 1H), 7.40 (dt, 1H), 7.18-7.28 (m, 3H), 6.75-6.81 (m, 2H), 6.71 (d, 1H), 3.95 (m, 2H), 3.49 (m, 2H). Mass (ES+)=319.1 (100%).

1. customquenched with water and 10% sodium hydroxide
2. filtrationThe quenched mixture was filtered through Celite
3. washthe filter was washed with ethyl acetate
4. dry with materialThe filtrate was dried over magnesium sulfate
5. filtrationfiltered
6. concentrationconcentrated to an oil
7. customSilica gel purification