Diethyl Ether → Methyl 3-[5-amino-4-(cyclohexylcarbamoyl)pyrazol-1-yl]benzoate

Participants

Reaction Conditions

Reaction Steps

2-cyano-N-cyclohexyl-3-ethoxy-prop-2-enamide (Intermediate #17) (605 mg, 2.73 mmol) and methyl 3-hydrazinylbenzoate hydrochloride (552 mg, 2.73 mmol) were suspended in ethanol (20 mL). DIPEA (352 mg, 2.73 mmol) was added and the mixture heated to 70° C. for 1 h. The reaction mixture was cooled to ambient and concentrated to a small volume. Water (50 mL) was added and the resulting solid recovered by filtration, redissolved in ethyl acetate (50 mL), dried (MgSO4) and evaporated to give a brown solid which was slurried with ether and recovered by filtration to give the title compound as light brown solid (443 mg, 47%).

Provenance & Evidence