反应详情

2-Fluoro-4-chloro-5-cyclopentyloxyphenylhydrazine (24.5 g, 0.10 mol), 2-ethoxycarbonylcyclohexanone (17.0 g, 0.10 mol) were dissolved in acetic acid (200 ml), and stirred for 2 hours while heating under refluxing. After completion of the reaction, the solvent was distilled off to obtain a crude product (37 g). The product was washed with a mixed solvent of benzene/hexane to obtain 2N-(2-fluoro-4-chloro-5-cyclopentyloxyphenyl)-1,2,4,5,6,7-hexahydro-3H indazol-3-one as a white solid (25.8 g, 72.3% yield).

1. temperaturewhile heating
2. temperatureunder refluxing
3. customAfter completion of the reaction
4. distillationthe solvent was distilled off
5. customto obtain a crude product (37 g)
6. washThe product was washed with a mixed solvent of benzene/hexane