Methyl iodide → (+/-)-2-[trans-2-(Methyloxy)cyclohexyl]-5-{[4-(1H-pyrazol-1-yl)phenyl]methyl}-2,5-dihydro-3H-pyrazolo[4,3-c]quinolin-3-one

Participants

Reaction Conditions

Reaction Steps

(±)-2-(trans-2-Hydroxycyclohexyl)-5-{[4-(1H-pyrazol-1-yl)phenyl]methyl}-2,5-dihydro-3H-pyrazolo[4,3-c]quinolin-3-one (Example 508, 73 mg, 0.17 mmol) was dissolved in degassed N,N-dimethylformamide (3 mL), cooled to 0° C. and treated with sodium hydride (10 mg, 0.25 mmol, 1.5 equiv). After stirring for 15 minutes, the mixture was warmed to ambient temperature, stirred for 15 minutes and cooled to 0° C. The mixture was treated with methyl iodide (0.026 mL, 0.41 mmol, 2.5 equiv) and stirred at 0° C. for 1 hour. The mixture was treated with sodium bicarbonate (1.5 mL, aqueous saturated) and then poured into sodium bicarbonate (25 mL, aqueous saturated). The aqueous layer was extracted with ethyl acetate (2×100 mL), dried with sodium sulfate, filtered and concentrated in vacuo. The mixture was purified by silica gel gradient chromatography (100:0 to 90:10; dichloromethane:methanol), providing the titled compound: 1H-NMR (400 MHz, CDCl3) δ 8.40-8.37 (1H, m), 7.89 (1H, d, J=2.4 Hz), 7.72-7.68 (3H, m), 7.46-7.42 (2H, m), 7.40-736 (1H, m), 7.28 (2H, d, J=8.9 Hz), 6.46 (1H, m), 5.44 (2H, s), 4.39 (1H, td, J=10.2, 5.5 Hz), 3.83-3.77 (1H, m), 3.22 (3H, s), 2.27-2.23 (1H, m), 2.04-1.93 (2H, m), 1.86-1.77 (2H, m), 1.48-1.34 (4H, m) ppm; high resolution mass spectrometry (ES+) m/z 454.2250 [(M+H)+; calculated for C27H28N5O2: 454.2238].

Provenance & Evidence