Sodium hydride → 2-(2-(2,4-difluorophenoxy)quinolin-8-yl)-6,7-dihydro-1H-pyrrolo[3,2-c]pyridin-4(5H)-one

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Reaction Conditions

Reaction Steps

To NaH (60 wt % in mineral oil; 0.071 g, 1.763 mmol) in 1 mL DMF was added 2,4-difluorophenol (0.229 g, 1.76 mmol). After 10 min, a clear/colorless solution resulted. 2-(2-Chloroquinolin-8-yl)-6,7-dihydro-1H-pyrrolo[3,2-c]pyridin-4(5H)-one (Example 1; 0.075 g, 0.252 mmol) was added and the reaction became dark red. The reaction was sealed and heated to 90° C. for 4 h, then cooled to RT and stirred overnight. The reaction was cooled and partitioned between saturated aq. NH4Cl and EtOAc. The organic layer was washed with saturated aq. NaHCO3 (1×), water (1×), saturated aq. NaCl (1×), and the organics were dried over anhydrous Na2SO4, filtered, and concentrated in vacuo. The material was treated with DCM and purified by silica gel chromatography using 0-50% 90/10 DCM/MeOH in DCM. The product-containing fractions were concentrated to afford 2-(2-(2,4-difluorophenoxy)quinolin-8-yl)-6,7-dihydro-1H-pyrrolo[3,2-c]pyridin-4(5H)-one (0.036 g, 0.092 mmol, 37% yield) as a yellow solid: 1H NMR (400 MHz, DMSO-d6) δ ppm 10.99 (1H, br. s), 8.52 (1H, d, J=9.0 Hz), 8.09 (1H, dd, J=7.6, 1.4 Hz), 7.79-7.85 (1H, m), 7.55-7.69 (2H, m), 7.51 (1H, t, J=7.7 Hz), 7.47 (1H, d, J=9.0 Hz), 7.30 (1H, dddd, J=9.2, 7.9, 3.1, 1.5 Hz), 6.91-6.94 (1H, m), 6.90 (1H, d, J=2.3 Hz), 3.34-3.40 (2H, m), 2.52-2.57 (2H, m). m/z (ESI, +ve) 392.1 (M+H)+.

Provenance & Evidence