Hydrochloric Acid → 1-(2-(4-Methoxyphenyl)pyrazolo[1,5-a]pyridin-3-yl)-2-methylpropan-1-one oxime

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Reaction Steps

To a solution of 4.4 (14.9 mmol) of 1-(2-(4-methoxyphenyl)pyrazolo[1,5-a]pyridin-3-yl)-2-methylpropan-1-one in 32 ml of anhydrous EtOH was added 4.15 g of hydroxylamine hydrochloride, followed by a solution of 13.73 g (14.9 mmol) of NaOH in 10 ml water dropwise. The mixture was stirred and refluxed over night. After cooling, the solution was poured into a solution of 6 ml 6N HCl and 100 ml ice water with stirring for 30 minutes. The mixture was extracted with ethyl acetate three times. The organic phase was washed with brine and dried over MgSO4. After evaporation of the solvent under vacuum, 5 g of crude product was obtained. Purification on an aluminum oxide column with hexane-dichloromethane-ethyl acetate as eluant afforded 2.33 g (50.5%) of 1-(2-(4-methoxyphenyl)pyrazolo[1,5-a]pyridin-3-yl)-2-methylpropan-1-one oxime. Compound 1022.

Provenance & Evidence