2-(4-chloro-3,5-diphenyl-1H-pyrazolo[3,4-c]pyridazin-1-yl)acetaldehyde → 1-(4-chloro-3,5-diphenyl-1H-pyrazolo[3,4-c]pyridazin-1-yl)propan-2-ol

Participants

Reaction Steps

A solution of 2-(4-chloro-3,5-diphenyl-1H-pyrazolo[3,4-c]pyridazin-1-yl)acetaldehyde (128 mg, 0.29 mmol) in THF (2.9 mL) was added dropwise over 30 min to a solution of methyl magnesium chloride (290 μL, of 3 M solution diluted in 2.9 mL THF) at 0° C. The crude mixture was partitioned between CH2Cl2 and 2 M hydrochloric acid. The aqueous phase was extracted with CH2Cl2 and the combined organic layers were passed over a phase separator and concentrated under reduced pressure. The reaction was repeated with another 80 mg of starting 2-(4-chloro-3,5-diphenyl-1H-pyrazolo[3,4-c]pyridazin-1-yl)acetaldehyde and the combined crude mixtures were purified by column chromatography (silica gel, gradient 50 to 100% ethyl acetate/isohexane). Additional preparative HPLC purification yielded 7.2 mg of Compound 91.

Provenance & Evidence