反应详情

A solution of carbonyl diimidazole (1.07 g, 6.57 mmol) in anhydrous THF (8 ml) was added to a stirred boiling solution of the hydroxamic acid (602 mg, 3.29 mmol) in THF (6 ml). The resulting solution was heated at reflux for approx. 8-10 hours, then allowed to cool to room temperature and stirred overnight under an argon atmosphere. Thin layer chromatography (tlc) (silica; 1:1 hexane/ethyl acetate) showed minimal starting material and new non polar material. The solution was evaporated on a rotary evaporator to give an orange colored oil. Water (6 ml) was added, and contents cooled (ice bath) and acidified to pH 2 with concentrated hydrochloric acid. The crude, damp 3-hydroxy-6-methoxy-1,2-benzisoxazole precipitated as a cream orange solid (645 mg).

1. temperatureThe resulting solution was heated
2. temperatureat reflux for approx. 8-10 hours
3. customThe solution was evaporated on a rotary evaporator
4. customto give an orange colored oil
5. temperaturecontents cooled (ice bath)
6. customThe crude, damp 3-hydroxy-6-methoxy-1,2-benzisoxazole precipitated as a cream orange solid (645 mg)