(2-Methoxyethyl)hydrazine → 2-Acetylamino-5-[2-(2-methoxy-ethyl)-2H-pyrazol-3-yl]-4-trifluoromethyl-benzoic acid methyl ester

Participants

Reaction Conditions

Reaction Steps

A mixture of 2-acetylamino-5-((E)-3-dimethylamino-acryloyl)-4-trifluoromethyl-benzoic acid methyl ester (600 mg, 1.67 mmol) and (2-methoxy-ethyl)-hydrazine (151 mg, 1.68 mmol) in toluene (10 mL) was stirred at 90° C. for 40 h. Four portions of (2-methoxy-ethyl)-hydrazine (one equiv each day) were added over 4 d and the mixture was kept at 90° C. The mixture was concentrated to dryness in vacuo. The crude product was purified by flash chromatography (silica gel, DCM/MeOH (100:0 to 60:40)) to provide the title compound as a yellow syrup (352 mg, 55%). ES-MS: m/z 386.3 [M+H]+, rt 5.50 min.

Provenance & Evidence