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To a mixture of compound 2 (674 mg, 2 mmol) and triethylamine (0.55 ml, 4 mmol) in tetrahydrofuran (10 ml) was added dropwise 2,4-difluorobezoyl chloride (440 mg, 2.5 mmol) in 5 ml tetrahydrofuran at 0° C. The reaction mixture was stirred at 0° C. for 30 minutes and at room temperature for 18 h. The solvent was removed under reduced pressure, the residue was dissolved in dichloromethane (50 ml). The organic phase was washed with brine, dried over sodium sulphate. The solvent was removed under reduced pressure and the resulting product was purified on a column of silica gel (EtOAc/hexane, 9:1) to give the title compound as colorless prisms (448 mg, 47%).

1. customThe solvent was removed under reduced pressure
2. dissolutionthe residue was dissolved in dichloromethane (50 ml)
3. washThe organic phase was washed with brine
4. dry with materialdried over sodium sulphate
5. customThe solvent was removed under reduced pressure
6. customthe resulting product was purified on a column of silica gel (EtOAc/hexane, 9:1)