反应详情

The mixture of 3-hydrazinobenzoic acid (2.0 g), 1,1,3,3-tetramethoxypropane (2.2 ml) and conc. hydrochloric acid (2.4 ml) in methanol (10.0 ml) was heated under reflux for 2 hours, and the mixture was evaporated in vacuo. The residue was dissolved in ethyl acetate, washed with a saturated aqueous sodium bicarbonate solution and brine. The residue was obtained by evaporating solvent, and purified by column chromatography on silica gel eluting with dichloromethane. The fractions containing the desired product were collected and evaporated in vacuo to give methyl 3-(pyrazol-1-yl)benzoate (1.33 g).

1. temperaturewas heated
2. temperatureunder reflux for 2 hours
3. customthe mixture was evaporated in vacuo
4. dissolutionThe residue was dissolved in ethyl acetate
5. washwashed with a saturated aqueous sodium bicarbonate solution and brine
6. customThe residue was obtained
7. customby evaporating solvent
8. custompurified by column chromatography on silica gel eluting with dichloromethane
9. additionThe fractions containing the desired product
10. customwere collected
11. customevaporated in vacuo