Potassium Phosphate, Tribasic → GZ 389988)

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of 6-bromo-3-(3-methoxy-4-(4-methoxybenzyloxyl)benzyl)-3H-imidazo[4,5-b]pyridin-2-amine (0.25 g, 0.53 mmol) in 1,4-dioxane (10 mL) and water (4 mL) was added 1-methyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (0.14 g, 0.66 mmol), potassium phosphate tribasic (0.39 g, 1.84 mmol), tricyclohexylphosphine (0.015 g, 0.052 mmol), palladium(II) acetate (0.005 g, 0.026 mmol). The reaction mixture heated to 125° C. in a microwave reactor. After 15 min, the reaction mixture was allowed to cool to room temperature and was diluted with water. The mixture was extracted twice with ethyl acetate. The combined organic phases were washed with brine, dried over magnesium sulfate, filtered, and concentrated to provide 0.36 g of a greenish brown solid. Chromatographic purification (Combi-Flash, 12 g SiO2 gold column, 1-10% 2M ammonia in methanol/dichloromethane) afforded 0.10 g (41%) of the product as a light green solid: 1H NMR (400 MHz, DMSO-d6) δ 8.12-8.08 (m, 2H), 7.83 (d, J=0.6 Hz, 1H), 7.58 (d, J=1.9 Hz, 1H), 7.32 (d, J=8.7 Hz, 2H), 7.08 (d, J=1.9 Hz, 1H), 6.96-6.85 (m, 5H), 6.72 (dd, J=8.3, 1.9 Hz, 1H), 5.18 (s, 2H), 4.92 (s, 2H), 3.85 (s, 3H), 3.74 (s, 3H), 3.70 (s, 3H) ppm, (M+1)=471.

Provenance & Evidence