Hydrochloric Acid → 6-(2,6-dichloro-3,5-dimethoxyphenyl)-3-(1-methyl-1H-pyrazol-4-yl)-1H-pyrazolo[4,3-c]pyridine

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Reaction Steps

At 0° C. to a stirring solution of 6-(3,5-dimethoxyphenyl)-3-(1-methyl-1H-pyrazol-4-yl)-1-(tetrahydro-2H-pyran-2-yl)-1H-pyrazolo[4,3-c]pyridine (80 mg, 0.2 mmol) in methylene chloride (3 mL) was added dropwise a solution of sulfuryl chloride (31 μL, 0.38 mmol)(Acros Organics, Cat. #: 37815) in methylene chloride (1 mL). The mixture was stirred at r.t. overnight. To the mixture was added acetonitrile (2 mL) and it was stirred at r.t. for 1 h. Then, to the mixture was added another 31 μL of sulfuryl chloride and it was stirred at r.t. for 4 h. The solvent was removed under reduced pressure and the residue was treated with methylene chloride and sat'd NaHCO3 solution. After separation the aq. layer was extracted with methylene chloride. The combined organic layers were dried over Na2SO4. After filtration the filtrate was 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 an intermediate which was dissolved in methanol (3 mL), and cooled to 0° C. To the solution was added a pre-cooled HCl solution prepared from acetyl chloride (700 μL, 10 mmol) and methanol (1 mL). The mixture was stirred at r.t. for 4 h and then the solvents were removed. The residue was dissolved in methanol, and purified by RP-HPLC (pH=2) to afford the desired product (4.8 mg) as a TFA salt. LCMS (M+H)+=404.1.

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