[Cl:1][C:2]1[CH:8]=[CH:7][C:5]([NH2:6])=[C:4]([F:9])[CH:3]=1.[F:10][C:11]([F:17])([F:16])[CH2:12][C:13](O)=[O:14].CCN(CC)CC.CN(C(ON1N=NC2C=CC=NC1=2)=[N+](C)C)C.F[P-](F)(F)(F)(F)F>C(Cl)Cl>[Cl:1][C:2]1[CH:8]=[CH:7][C:5]([NH:6][C:13](=[O:14])[CH2:12][C:11]([F:17])([F:16])[F:10])=[C:4]([F:9])[CH:3]=1
4-Chloro-2-fluoroaniline (3 g, 20.7 mmol), 3,3,3-trifluoropropanoic acid (2.6 g, 20.7 mmol) and Et3N (5.8 mL) were dissolved in 50 mL of DCM. To this solution was added HATU (8.6 g, 22.7 mmol) slowly and then stirred overnight. The organic phases was washed with aq. NH4Cl (50 mL), NaHCO3 solution (50 mL) and brine (100 mL). The combined organic phases were evaporated and purified by column chromatography (PE/EA=5/1) to give N-(4-chloro-2-fluorophenyl)-3,3,3-trifluoropropanamide which was pure enough for next step. (4.7 g, yield: 90%) was a yellow solid. MS obsd. (ESI+) [(M+H)+] 256.
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