反应详情

A solution of the oxime 125 (100 mg, 0.47 mmol) in acetic anhydride (2 ml) was set to reflux for 3 h and then at 90° C. for 48 h. The acetic anhydride was removed under reduced pressure and the residue was partitioned between a cold aqueous K2CO3 solution and EtOAc. The organic phase was dried over anhydrous sodium sulfate, concentrated to dryness and remained solid was purified by column chromatography, eluents 25% EtOAc/hexane (25:75), then 100% EtOAc, to afford the title compound 126 (65 mg, 71% yield). MS (m/z) 195.1/197.1 (M+H).

1. temperatureto reflux for 3 h
2. customThe acetic anhydride was removed under reduced pressure
3. customthe residue was partitioned between a cold aqueous K2CO3 solution and EtOAc
4. dry with materialThe organic phase was dried over anhydrous sodium sulfate
5. concentrationconcentrated to dryness
6. customwas purified by column chromatography, eluents 25% EtOAc/hexane (25:75)