FC(F)(F)C(OC(=O)C(F)(F)F)=O.[I:14][C:15]1[CH:16]=[C:17]([CH:21]=[CH:22][C:23]=1[CH3:24])[C:18]([NH2:20])=O.C(N(CC)CC)C.C(=O)([O-])[O-].[K+].[K+]>ClCCl>[I:14][C:15]1[CH:16]=[C:17]([CH:21]=[CH:22][C:23]=1[CH3:24])[C:18]#[N:20]2,2,2-trifluoroacetic anhydride (8.00 mL, 57.5 mmol) was added dropwise to a stirred solution of 3-iodo-4-methylbenzamide (preparation 48a, 6.00 g, 23.0 mmol) and triethylamine (8.10 mL, 57.5 mmol) in dichloromethane (50 mL) at 0° C. The mixture was warmed to room temperature and stirred for 2 hours. Further dichloromethane and saturated aqueous potassium carbonate solution were added and the organic layer was washed with 2M aqueous hydrochloric acid, 2M aqueous sodium hydroxide solution, brine, dried (MgSO4) and evaporated to give the title compound (4.50 g, 80%) as a pale orange solid.
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