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To a solution of 1,3,4,5-tetrahydrobenzo[b]azepin-2-one (12.9 g, 80.0 mmol) in 720 mL of tetrahydrofuran was added 80 mL of lithium aluminum hydride (1 M solution in tetrahydrofuran). The reaction mixture was stirred at reflux for 3 hours and cooled to 0° C. The reaction was quenched by the sequential addition of 3 mL of water, 3 mL of 15% sodium hydroxide, and 9 mL of water. The mixture was filtered through Celite and the filter cake rinsed with ethyl acetate. The filtrate was concentrated under reduced pressure to provide 10.0 g (85%) of the desired compound as an orange solid.

1. temperatureat reflux for 3 hours
2. customThe reaction was quenched by the sequential addition of 3 mL of water, 3 mL of 15% sodium hydroxide, and 9 mL of water
3. filtrationThe mixture was filtered through Celite
4. washthe filter cake rinsed with ethyl acetate
5. concentrationThe filtrate was concentrated under reduced pressure