Hydrochloric Acid → 1-(9-Methyl-5,7,8,9-tetrahydro-6H-pyrido[3',4':4,5]pyrrolo[2,3-b]pyridin-2-yl)-4-(6-(trifluoromethyl)pyridazin-3-yl)pyridin-2(1H)-one

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Reaction Steps

tert-Butyl 9-methyl-2-(2-oxo-4-(6-(trifluoromethyl)pyridazin-3-yl)pyridin-1(2H)-yl)-5,7,8,9-tetrahydro-6H-pyrido[3′,4′:4,5]pyrrolo[2,3-b]pyridine-6-carboxylate (70 mg, 0.13 mmol) was treated with 1.25 M HCl in MeOH (3.4 mL), and the resulting suspension was stirred at ambient temperature for 18 h. The resulting suspension was diluted with CH2Cl2 (1.8 mL) and stirred at ambient temperature for 4 h. To the suspension 1.25 M HCl in MeOH (2.0 mL) was added, and the resulting suspension was stirred at ambient temperature for 18 h. The resulting solids were collected by filtration, dissolved in CH2Cl2 (30 mL), and washed with saturated NaHCO3 solution (50 mL). The resulting layers were separated, and the organic extraction was dried over Na2SO4 and concentrated under reduced pressure to dryness. Flash chromatography (12 g ISCO column, CH2Cl2/(80:18:2 CH2Cl2/MeOH/NH4OH), 100:0 for 1 column volumes, increased to 0:100 over 20 column volumes and held for 83 column volumes) provided the title compound (38 mg, 67%) as a yellow powder: 1H NMR (500 MHz, DMSO-d6) δ 8.71 (d, J=8.5 Hz, 1H), 8.46 (d, J=9.0 Hz, 1H), 8.13 (d, J=7.0 Hz, 1H), 7.96 (d, J=8.5 Hz, 1H), 7.40 (d, J=2.0 Hz, 1H), 7.38 (d, J=8.0 Hz, 1H), 7.22 (dd, J=7.5, 2.0 Hz, 1H), 3.91 (s, 2H), 3.69 (s, 3H), 3.11 (t, J=5.5 Hz, 2H), 2.78 (t, J=5.5 Hz, 2H); ESI MS m/z 427 [M+H]+.

Provenance & Evidence