Phosphorus sulfide (P2S5) → 1,3,4,5-Tetrahydro-2H-1-benzazepine-2-thione

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To a solution of Example 182A (12.435 g, 77 mmol) in pyridine (309 mL) under nitrogen was added phosphorus pentasulfide (34.3 g, 154 mmol), and the mixture was heated at 120° C. (reflux) for 2 hours. The solvent was decanted and water was added. The product was extracted with dichloromethane, pre-absorbed onto silica gel and purified by silica gel chromatography (Analogix IntelliFlash™ 280, SF10-150) eluting with 30% ethyl acetate/hexanes to obtain the title compound. 1H NMR (500 MHz, DMSO-d6) δ ppm 11.75 (s, 1H), 7.32-7.25 (m, 2H), 7.19 (td, J=7.5, 1.2, 1H), 7.10-7.00 (m, 1H), 2.63 (m, 4H), 2.20 (m, 2H); MS (ESI−) m/z 176.1 (M−H)−.

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