Acetic Acid → HCID 9951707, compound

Participants

Reaction Steps

To a solution of 5-amino-1-(2,4-difluorophenyl)-4-[3-formylbenzoyl] pyrazole (0.3 g, 0.92 mmol), piperidine (0.1 ml, 1.0 mmol), acetic acid (0.05 ml) in 1,2-dichloroethane (5 ml) was added sodium triacetoxyborohydride (0.29 g, 1.37 mmol). After stirring at room temperature for 12 hours, the reaction was diluted with 10% hydrochloric acid and ethyl acetate (10 ml). The aqueous layer was separated and neutralized to pH 9 with sodium hydroxide and was then extracted with ethyl acetate. The combined organics were separated and washed with brine (25 ml), dried over MgSO4 and then concentrated in vacuo to a brown oil. The oil was purified by flash column chromatography using 1:1 hexanes/ethyl acetate to remove impurities and ethyl acetate to elute the desired product. Concentration of the column fractions in vacuo gave 5-amino-1-(4-fluorophenyl)-4-[3-(1-piperidinylmethyl)benzoyl] pyrazole as an oil (0.211 g). The compound was triturated to a solid from hexanes/ethyl acetate.

Provenance & Evidence