1-Methyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole → ethyl (3-(3-methoxy-4-((4-methoxybenzyl)oxy)benzyl)-6-(1-methyl-1H-pyrazol-4-yl)-3H-imidazo[4,5-b]pyridin-2-yl)carbamate

Participants

Reaction Conditions

Reaction Steps

To a stirred solution of ethyl (6-iodo-3-(3-methoxy-4-((4-methoxybenzyl)oxy)benzyl)-3H-imidazo[4,5-b]pyridin-2-yl)carbamate (11.80 g, 20.05 mmol) and 1-methyl-4-(4,4,5,5-tetramethyl-1,3,2-dioxaborolan-2-yl)-1H-pyrazole (5.00 g, 24.03 mmol) in N,N-dimethylformamide (100 mL) and 2M aqueous sodium carbonate solution (10 mL) was added (1,1′-bis(diphenylphosphino)ferrocene)palladium(II) dichloride (0.87 g, 1.19 mmol). The resulting mixture was heated to 80° C. under a nitrogen atmosphere. After 4 h, the mixture was allowed to cool to room temperature and was filtered through Celite. The filtrate was diluted with water (150 mL) and extracted with ethyl acetate (3×200 mL). The combined organic phases were washed with water (300 mL) and brine (2×300 mL), dried over sodium sulfate, filtered, and concentrated. Chromatographic purification (silica gel, 5% methanol in dichloromethane elute) afforded 2.50 g (23%) of ethyl (3-(3-methoxy-4-((4-methoxybenzyl)oxy)benzyl)-6-(1-methyl-1H-pyrazol-4-yl)-3H-imidazo[4,5-b]pyridin-2-yl)carbamate as a gray solid.

Provenance & Evidence