Potassium Carbonate → 4-methyl-2-(2H-pyrazol-3-yl)-thiazole-5-carboxylic acid (pyridin-3-ylmethyl)-amide

Participants

Reaction Conditions

Reaction Steps

To a solution of 2-bromo-4-methyl-thiazole-5-carboxylic acid (pyridine-3-ylmethyl)-amide (5.0 g, 16.0 mmol) in toluene (30 mL), water (10 mL) and ethanol (10 mL) was added 1H-pyrazole-5-boronic acid (2.15 g, 19.2 mmol), Pd(PPh3)4 (1.85 g, 1.60 mmol), and potassium carbonate (6.64 g, 48.1 mmol). The resulting mixture was degassed three times and heated to 100° C. for 16 hr. The reaction mixture was cooled to room temperature, diluted with ethyl acetate (200 mL) and washed with brine (2×100 mL). The organic phase was dried (Na2SO4) and evaporated. The residue was recrystallized from ethyl acetate to provide 4-methyl-2-(2H-pyrazol-3-yl)-thiazole-5-carboxylic acid (pyridine-3-ylmethyl)amide as a white solid (4.20 g, 85% yield).

Provenance & Evidence