反应详情

To a stirred mixture of acetic anhydride (46.29 g, 0.45 mol) and triethylamine (13.77 g, 0.14 mol), 2-(N-acetylcarboxymethylamino)benzoic acid of Example 1b (11.36 g, 0.048 mol) was added at room temperature. The mixture was refluxed for 20 min and concentrated in vacuum to give an oily residue. Water (350 mL) was added under vigorous stirring, and the mixture was refrigerated overnight. The solid product was collected, washed with water and air-dried to give 9.0 g (86%) of the product which was used in the next step without purification.

1. additionwas added at room temperature
2. temperatureThe mixture was refluxed for 20 min
3. concentrationconcentrated in vacuum
4. customto give an oily residue
5. customThe solid product was collected
6. washwashed with water
7. customair-dried