To a solution of 4-[5-cyclopropyl-3-(5-chloro-2-thienyl)-1H-pyrazol-4-yl]pyridine (1 eq, 0.32 mmol) in 2 mL N,N-dimethylformamide were added 2-iodopropane (1.5 eq, 0.48 mmol) and cesium carbonate (2 eq, 0.64 mmol). The reaction mixture was stirred overnight at room temperature, diluted with water and extracted three times with ethyl acetate. The combined organic extracts were dried over MgSO4, filtered and concentrated. The residue was purified by chromatography on silica gel (heptane:ethyl acetate 5:1 to 1:1) to afford 28.8 mg of 4-[5-cyclopropyl-1-isopropyl-3-(5-chloro-2-thienyl)-1H-pyrazol-4-yl]pyridine (26% yield) and 30.2 mg of 4-[3-cyclopropyl-1-isopropyl-5-(5-chloro-2-thienyl)-1H-pyrazol-4-yl]pyridine (28% yield).
