[H-].[Na+].[Br:3][C:4]1[C:5](=[O:12])[N:6]([CH3:11])[C:7](=[O:10])[NH:8][N:9]=1.[F:13][C:14]([F:20])([F:19])[CH2:15][CH2:16][CH2:17]I>CN(C=O)C>[Br:3][C:4]1[C:5](=[O:12])[N:6]([CH3:11])[C:7](=[O:10])[N:8]([CH2:17][CH2:16][CH2:15][C:14]([F:20])([F:19])[F:13])[N:9]=10.85 g (21.3 mmol) of NaH (at 60% in paraffin) are placed in 10 mL of DMF under nitrogen. A solution of 4 g (19.4 mmol) of intermediate 2a in 40 mL of DMF is poured dropwise. The reaction medium is stirred for 1 h at room temperature and then 5 g (21.3 mmol) of 1,1,1-trifluoro-4-iodo-butane are added dropwise, and stirring is then continued for 3 h at room temperature. After dry concentration, the obtained residue is taken up with H2O and extracted with ethyl acetate. After drying on MgSO4, the organic phases are evaporated and the obtained oil is purified by flash chromatography on silica (petroleum ether-AcOEt: 80-20). 5.3 g of crystals corresponding to the compound 4a (yield=87%) are isolated.
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