反应详情

3-(4-Methoxy-phenyl)-isoxazole-5-carboxylic acid ethyl ester (available from ChemDiv Inc., 6605 Nancy Ridge Dr, San Diego, Calif., 92121, USA; 15 g, 60.1 mmol) was taken up in CH2Cl2 (30 mL) and 1 M BBr3 (400 mL, 400 mmol) was added. The reaction mixture was stirred at room temperature overnight. The mixture was added to a beaker of ice-water and the solid was collected by filtration. The solid was taken up in EtOAc and the solution was washed with water to remove most of the undesired carboxylic acid side product. Yield: 1.9 g (14%).

1. filtrationthe solid was collected by filtration
2. washthe solution was washed with water
3. customto remove most of the undesired carboxylic acid side product