Triethylamine → N-[2-(biphenyl-4-yloxy)ethyl]-N-cyclopropyl-5-fluoro-1,3-dimethyl-1H-pyrazole-4-carboxamide

Participants

Reaction Conditions

Reaction Steps

At ambient temperature, a solution of 230 mg (1.29 mmol) of 5-fluoro-1,3-dimethyl-1H-pyrazole-4-carbonyl chloride in 1 ml of tetrahydrofurane is added dropwise to a mixture of 300 mg (1.18 mmol) of N-[2-(biphenyl-4-yloxy)ethyl]cyclopropanamine as its hydrochloride salt and 250 mg (2.48 mmol) of triethylamine in 5 ml of tetrahydrofurane. The reaction mixture is stirred for 2 hrs at 80° C. The solvent is removed under vacuum and 10 ml of water are then added to the residue. The watery layer is extracted twice with ethyl acetate (2×25 ml) and the combined organic layers are successively washed by a 1 N solution of HCl, a saturated solution of potassium carbonate and brine and dried of magnesium sulfate to gave after concentration 750 mg of a yellow oil. Column chromatography (gradient heptane/ethyl acetate) yielded 220 mg (47% yield) of N-[2-(biphenyl-4-yloxy)ethyl]-N-cyclopropyl-5-fluoro-1,3-dimethyl-1H-pyrazole-4-carboxamide as a colourless oil (M+H=394).

Provenance & Evidence