[CH3:1][O:2][C:3]1[CH:18]=[CH:17][CH:16]=[CH:15][C:4]=1[O:5][C:6]1[CH:14]=[CH:13][CH:12]=[CH:11][C:7]=1[C:8]([OH:10])=O.FC(F)(F)C(OC(=O)C(F)(F)F)=O.B(F)(F)F.CCOCC.O>C(Cl)Cl>[CH3:1][O:2][C:3]1[C:4]2[O:5][C:6]3[C:7](=[CH:11][CH:12]=[CH:13][CH:14]=3)[C:8](=[O:10])[C:15]=2[CH:16]=[CH:17][CH:18]=1To a suspension of 2-(2-methoxy-phenoxy)-benzoic acid (16.8 g, 68.8 mmol) in methylene chloride (100 mL) at 0° C. was added dropwise trifluoroacetic anhydride (12.7 mL, 89.4 mmol), and the reaction was stirred for 30 min at 0° C. At that time, boron trifluoride diethyl etherate (1.29 mL, 10.3 mmol) was added dropwise. The reaction was stirred overnight at rt, poured into H2O, and washed with brine. The organic phase was dried over MgSO4, filtered, and concentrated to give 12.4 g (54.8 mmol) of Compound 2a.
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