反应详情

A suspension of p-chlorobenzamide (3.02 g, 20.0 mmol), the product from Example 18A (3.24 g, 20.0 mmol), and benzotriazole (2.38 g, 20.0 mmol) in benzene (75 mL) was treated with p-toluenesulfonic acid (190 mg, 1.00 mmol). The solution was heated at reflux under Dean-Stark conditions for 10 hours, then cooled gradually to ambient temperature. The solvent was removed under vacuum and the residue was purified by flash chromatography (elution with 15% EtOAc/hexanes) to provide the title compound (3.63 g) as a white solid.

1. temperatureThe solution was heated
2. temperatureat reflux under Dean-Stark conditions for 10 hours
3. customThe solvent was removed under vacuum
4. customthe residue was purified by flash chromatography (elution with 15% EtOAc/hexanes)