Pyridine → 1-(2-(4-methoxyphenyl)pyrazolo[1,5-a]pyridin-3-yl)-2-methylpropan-1-one O-carbamoyl oxime

Participants

Reaction Steps

To a solution of 775 mg (2.5 mmol) of 1-(2-(4-methoxyphenyl)pyrazolo[1,5-a]pyridin-3-yl)-2-methylpropan-1-one oxime in 5 ml of anhydrous THF was added 2 ml of trimethylsilyl isocyanate (85%) dropwise at 0° C. over 30 minutes. The mixture was stirred at room temperature over 48 hours, followed by addition of 500 μl pyridine. After stirring for another 4 hours the solvent was removed, and the residue was extracted with ethyl acetate three times. The combined organic layers were washed with 10% citric acid twice and dried over MgSO4. After evaporation of the solvent, 900 mg of crude product was obtained, which was purified on an aluminum oxide column with hexane-dichloromethane-ethyl acetate as eluant to yield 263 mg (29.8%) of 1-(2-(4-methoxyphenyl)pyrazolo[1,5-a]pyridin-3-yl)-2-methylpropan-1-one O-carbamoyl oxime. Compound 1023.

Provenance & Evidence