Propionyl chloride → 1-[4-(Cyanomethyl)-1-propanoylpiperidin-4-yl]-3-(phenylamino)-1H-pyrazole-4-carboxamide

Participants

Reaction Steps

To a suspension of 4-[4-carbamoyl-3-(phenylamino)-1H-pyrazol-1-yl]-4-(cyanomethyl)piperidinium trifluoroacetate (Intermediate #38-1) (50 mg, 0.11 mmol) in THF (1 mL) was added DIPEA (0.060 mL, 0.34 mmol), followed by propanoyl chloride (0.020 mL, 0.18 mmol). The resulting mixture was allowed to stir for 18 hours before the reaction mixture was concentrated in vacuo to afford an orange oil. The residue was dissolved in DMSO (2 mL) and purified by mass-triggered reverse phase preparative HPLC (MeCN/water, with 0.1% v/v TFA modifier). Desired fractions were identified, combined, diluted with saturated aqueous NaHCO3 and extracted with EtOAc (2×). The combined organic layers were washed with brine, dried over anhydrous Na2SO4, filtered and concentrated in vacuo to afford the title compound, Example #33-1, as a colorless solid.

Provenance & Evidence