A mixture of 6-(3,5-dimethoxyphenyl)-3-iodo-1H-pyrazolo[4,3-c]pyridine (0.50 g, 1.3 mmol), dihydropyran (360 μL, 3.9 mmol), and methanesulfonic acid (17 μL, 0.26 mmol) in tetrahydrofuran (3 mL) and methylene chloride (7.5 mL) was stirred at 80° C. for 2 days. After cooling, to the mixture was added some triethylamine, and concentrated under reduced pressure. The residue was purified by flash chromatography on a silica gel column with ethyl acetate in hexanes (0-50%) to afford the desired product (0.55 g). LCMS (M+H)+=466.0.
