[C:1]([C:5]1[CH:6]=[C:7]([CH:12]=[CH:13][C:14]=1[OH:15])[C:8]([O:10][CH3:11])=[O:9])([CH3:4])([CH3:3])[CH3:2].[I:16]N1C(=O)CCC1=O.FC(F)(F)S(O)(=O)=O.O>ClCCl.CO>[C:1]([C:5]1[CH:6]=[C:7]([CH:12]=[C:13]([I:16])[C:14]=1[OH:15])[C:8]([O:10][CH3:11])=[O:9])([CH3:4])([CH3:2])[CH3:3]Methyl 3-t-butyl-4-hydroxybenzoate (1.83 g) was dissolved in dichloromethane (24 mL) and methanol (3 mL), and N-iodosuccinimide (2.08 g) and trifluoromethanesulfonic acid (3 mL) were added to the solution, and then the mixture was stirred at room temperature for 15 minutes. Water was added to the reaction solution, and then the organic layer was separated. The organic layer was washed with 10% sodium thiosulfate and saturated brine, and then dried over anhydrous sodium sulfate. The solvent was distilled off under reduced pressure to obtain the title compound (2.77 g) as a brown crystal.
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