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2. The reaction mixture was stirred at 75 °C for 24 h. The crude reaction mixture was diluted with ether, filtered through a thin Celite pad, and washed several times with ether. The solution was concentrated in vacuo. The residue was chromatographed on a silica gel column (hexane/ EtOAc = 85/15) to give 195 mg (91%) of 3a.
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