[K].CC(C)([O-])C.[N+:7]([C:10]1[CH:11]=[C:12]([C:16]([F:19])([F:18])[F:17])[CH:13]=[CH:14][CH:15]=1)([O-:9])=[O:8].Cl[CH2:21][C:22]([O:24][C:25]([CH3:28])([CH3:27])[CH3:26])=[O:23]>CN(C)C=O>[N+:7]([C:10]1[CH:11]=[C:12]([C:16]([F:17])([F:18])[F:19])[CH:13]=[CH:14][C:15]=1[CH2:21][C:22]([O:24][C:25]([CH3:28])([CH3:27])[CH3:26])=[O:23])([O-:9])=[O:8]2.6 g of potassium-tert.butoxide are placed in 45 ml of dimethylformamide and at an internal temperature of −5° C. 1.3 ml of 3-nitro-trifluorotoluene and 1.5 ml of tert.butyl chloroacetate in 1 ml of dimethylformamide are added dropwise. The mixture is stirred for another 5 minutes and the solution is then poured onto ice water and the precipitate formed is suction filtered.
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