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A solution of 3,3,3-trifluoro-propionic acid methyl ester (24.6 g, 173 mmol) in methanol (173 mL) was treated with hydrazine hydrate (8.4 mL, 173 mmol). The resulting mixture was then heated under reflux for 16 h and filtered. The filtrate was adsorbed on silica, evaporated and chromatographed (SiO2, dichloromethane:methanol=95:5 to 90:10). The title compound (14.2 g, 58%) was obtained as a white solid. MS: m/e=142.1 [M]+.

1. temperatureThe resulting mixture was then heated
2. temperatureunder reflux for 16 h
3. filtrationfiltered
4. customevaporated
5. customchromatographed (SiO2, dichloromethane:methanol=95:5 to 90:10)