Hydrochloric Acid → 4-(Benzyloxy)-1-(2,9-dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indol-7-yl)pyridin-2(1H)-one hydrochloride

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A stirred solution of 7-bromo-2,9-dimethyl-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole (250 mg, 0.895 mmol) in DMSO (4 mL) under nitrogen was treated sequentially with 4-(benzyloxy)pyridin-2(1H)-one (180 mg, 0.895 mmol), 8-hydroxyquinoline (20 mg, 0.14 mmol), CuI (196 mg, 1.04 mmol) and K2CO3 (142 mg, 1.04 mmol). The mixture was placed under vacuum for 30 minutes and then flushed with nitrogen. After stirring overnight at 130° C., the mixture was allowed to cool to room temperature, diluted with CH2Cl2, washed with brine, dried over Na2SO4 and concentrated. Purification by flash column chromatography (12 g ISCO column eluting with methylene chloride and a methanol/ammonia mixture (10:1); gradient 100% methylene chloride to 80% methylene chloride over 30 min at 25 mL/min) provided the free-base. This was dissolved in methylene chloride (2 mL) and treated with 2 N HCl in Et2O (1 equivalent) and the mixture was concentrated to provide the title compound (131 mg, 33%) as a yellow solid: mp 270-274° C.; 1H NMR (500 MHz, CD3OD) δ 7.67-7.63 (m, 2H), 7.50-7.40 (m, 3H), 7.43-7.35 (m, 3H), 7.08 (dd, J=8.3, 1.6 Hz, 1H), 6.40 (dd, J=7.5, 2.6 Hz, 1H), 6.21 (d, J=2.6 Hz, 1H), 5.22 (s, 2H), 4.81-4.80 (m, 1H), 4.58 (d, J=15.3 Hz, 1H), 3.88-3.84 (m, 1H), 3.72 (s, 3H), 3.55-3.49 (m, 1H), 3.21-3.16 (m, 5H); ESI MS m/z 400 [M+H]+; HPLC (Method B)>98.9% (AUC), tR=13.0 min.

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