反应详情

2,3,4-Trifluoroaniline (2.94 g) and methyl pyruvate (2.04 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 crystals thus precipitated were filtered while washing with hexane. Thus the title compound (4.44 g) was obtained as slightly yellowish crystals. Various spectral data of this product was identical with those obtained in Example 5.

1. filtrationAfter filtering off Pd—C and magnesium sulfate
2. concentrationthe obtained filtrate was concentrated under reduced pressure
3. customThe crystals thus precipitated
4. filtrationwere filtered
5. washwhile washing with hexane