N-methoxy-N,1-dimethyl-1H-pyrazole-4-carboxamide → 1-(1-methyl-1H-pyrazol-4-yl)-2-phenylethanone

Participants

Reaction Steps

To a solution of N-methoxy-N,1-dimethyl-1H-pyrazole-4-carboxamide (4.6 g, 27.2 mmol) in anhydrous THF (50 mL) was added benzylmagnesium chloride (2.0 M in THF, 16.7 mL, 32.6 mmol) at −78° C. under N2, then stirred at the same temperature for 3 hours. The mixture was quenched with saturated NH4Cl solution, followed by a standard aqueous/EtOAc procedure. The crude was purified by silica gel column chromatography (PE:EtOAc=10:1) to give Intermediate 4 (4.0 g, yield 74%).

Provenance & Evidence