反应详情

Add isopropyl chloroformate (104 mL, 104 mmol, 1.0 M in toluene) dropwise to a solution of methyl 2-amino-4-bromobenzoate (14.5 g, 63.0 mmol) and pyridine (10.3 mL, 126.0 mmol) in dichloromethane (210 mL) at room temperature under nitrogen and stir for 5.5 h. Pour the reaction into water (500 mL) and separate the layers. Extract the aqueous layer with dichloromethane (2×100 mL) and combine the organic extracts and wash with 2 N HCl, saturated sodium bicarbonate and brine (100 mL each), then dry over sodium sulfate, filter and remove the solvent under reduced pressure to afford the title compound as a pale orange solid (19.2 g, 96%)

1. additionPour
2. customseparate the layers
3. extractionExtract the aqueous layer with dichloromethane (2×100 mL)
4. washwash with 2 N HCl, saturated sodium bicarbonate and brine (100 mL each)
5. dry with materialdry over sodium sulfate
6. filtrationfilter
7. customremove the solvent under reduced pressure