Hydrochloric Acid → 1-(5-bromo-4-chloro-2-methoxy-benzenesulfonyl)-2,3,4,5-tetrahydro-1H-benzo[b]azepine

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Reaction Steps

To a solution of DCM (8 mL) containing 1-(5-bromo-4-chloro-2-fluoro-benzenesulfonyl)-2,3,4,5-tetrahydro-1H-benzo[b]azepine (2.35 g, 5.6 mmol) was added 25% sodium methoxide in methanol (7.5 mL). The resulting suspension was stirred at rt for 3 hrs, followed by repartitioning with DCM (45 mL) and water (50 mL). A 6 N HCl solution was added dropwise until the aqueous layer pH was 7. The organic layer was separated, washed with water (2×30 mL), dried over MgSO4, and evaporated to afford 1-(5-bromo-4-chloro-2-methoxy-benzenesulfonyl)-2,3,4,5-tetrahydro-1H-benzo[b]azepine as the pale yellow foam (2.38 g). MS: 430.0 (M+H)+; tR=6.21 min (method 4). NMR (CDCl3), δ, 8.070 (1H, s), 7.130-7.219 (3H, m), 7.025-7.082 (1H, m), 6.761 (1H, d, J=7.5 Hz), 3.868 (3H, s), 3.733 (2H, m), 2.808-2.845 (2H, m), 1.902-1.940 (2H, m), 1.568-1.667 (2H, m).

Provenance & Evidence