反应详情

2,3, 4-Trifluoroaniline (2.94 g) and ethyl pyruvate (2.32 g) were dissolved in methanol (30 ml). After adding 5% Pd—C (2.0 g) and anhydrous magnesium sulfate (2.65 g), the mixture was stirred at 50° C. in a hydrogen atmosphere for 16 hours. After filtering off Pd—C and magnesium sulfate, the obtained filtrate was concentrated under reduced pressure. The obtained residue was subjected to silica gel column chromatography (ethyl acetate-normal hexane=1:4) to thereby give the title compound (4.69 g) as a pale yellow oily substance. Various spectral data of this product was identical with those obtained in Example 7.

1. filtrationAfter filtering off Pd—C and magnesium sulfate
2. concentrationthe obtained filtrate was concentrated under reduced pressure