反应详情

温度

80 °C

2-(3-Fluoro-4-(methylthio)phenyl)-2-oxoacetic acid (4.5 g, crude) was added to hydrazine hydrate (5.1 mL, 5 eq) at −50° C. The contents were heated to 80° C., KOH (2.7 g, 2.3 eq) was added and the overall reaction mixture was stirred for 12 h at 100° C. Progress of the reaction was monitored by TLC (50% ethyl acetate/hexane, Rf˜0.8). On completion of the reaction, to the contents was added water and ethyl acetate and the layers were separated. The aqueous layer was acidified with diluted HCl at 0-5° C., the precipitate was filtered and dried to yield 2-(3-fluoro-4-(methylthio)phenyl)acetic acid as a white colored solid (3 g, 71%).

1. customOn completion of the reaction
2. customthe layers were separated
3. customwas acidified with diluted HCl at 0-5° C.
4. filtrationthe precipitate was filtered
5. customdried