反应详情

To a DMF solution (50 mL) of 6-hydroxy-7-propyl-3-(trifluoromethyl)-1,2-benzisoxazole as prepared in Example 4 step 2 (6.5 gram, 26.5 mmol) was added 1,4-dibromobutane (16 mL, 133 mmol), followed by cesium carbonate (9.1 grams, 27.8 mmol). The mixture was stirred at room temperature overnight. After aqueous/ether work-up and silica gel chromatography (hexanes: 2.5% ethyl acetate), the title compound was obtained.