Cesium carbonate → ethyl 6-(6-(3-ethylureido)-4-(4-(1-methyl-1H-pyrazol-4-yl)thiazol-2-yl)pyridin-3-yl)-1-((1-methyl-1H-imidazol-4-yl)methyl)-4-oxo-1,4-dihydro-1,7-naphthyridine-3-carboxylate

Participants

Reaction Conditions

Reaction Steps

In a microwave vessel, 6-(3-ethylureido)-4-(4-(1-methyl-1H-pyrazol-4-yl)thiazol-2-yl)pyridin-3-ylboronic acid (Intermediate 98, 0.2 g, 0.54 mmol), ethyl 6-bromo-1-((1-methyl-1H-imidazol-4-yl)methyl)-4-oxo-1,4-dihydro-1,7-naphthyridine-3-carboxylate (Intermediate 102, 0.21 g, 0.54 mmol) and cesium carbonate (0.229 g, 0.70 mmol) were combined and suspended in a mixture of dioxane and water (5:1; 2.5 mL/0.5 mL). The suspension was degassed and purged with nitrogen. Pd(PPh3)4 (0.05 g, 0.04 mmol) was added and the mixture was degassed and purged a second time. The reaction mixture was heated in the microwave at 90° C. for 90 minutes. The reaction was partitioned between water and ethyl acetate, the layers were separated, and the organic phase was washed with saturated NaHCO3, water and brine, then dried over magnesium sulfate, and concentrated. The resulting solids were filtered, washed with acetonitrile followed by chloroform. Isolation gave 90 mg of the title compound as an off-white solid.

Provenance & Evidence