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

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Reaction Steps

At 0° C. (with ice-bath) to a stirring solution of 6-(2,6-dichloro-3,5-dimethoxyphenyl)-1-(tetrahydro-2H-pyran-2-yl)-1H-pyrazolo[4,3-c]pyridine (0.78 g, 1.9 mmol) in methanol (10 mL) was added drop-wise a pre-cooled (with ice-bath) HCl solution prepared from acetyl chloride (2.72 mL, 38.2 mmol) in methanol (15 mL). After the addition, the ice-bath was removed. The mixture was stirred at r.t. for 2 h, and then 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 (0.62 g). LC/MS (M+H)+=324.0.

Provenance & Evidence