Triethylamine → tert-butyl 4-[2-[(E)-(4-tert-butylphenyl)methylideneamino]oxyethoxy]-2-[4-(trifluoromethyl)benzoyl]oxybenzoate

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To a solution of 4-[2-(4-tert-butyl-benzylideneaminooxy)-ethoxy]-2-hydroxy-benzoic acid tert-butyl ester (0.298 g, 0.72 mmol) in methylene chloride (10 mL) was added triethylamine (0.200 mL, 1.43 mmol) and 4-trifluoromethyl benzoyl chloride (0.200 mL, 1.42 mmol). The reaction was stirred at room temperature overnight, poured into brine and the aqueous layer extracted with ethyl acetate. The combined organics dried over anhydrous magnesium sulfate and concentrated in vacuo. The residue was purified by flash chromatography using ethyl acetate/hexanes (8/92) to afford 4-{2-[({(E)-[4-(tert-butyl)phenyl]methylidene}amino)oxy]ethoxy}-2-{[4-(trifluoromethyl)benzoyl]oxy}benzoic acid tert-butyl ester (0.405 g, 96%) as a colorless oil. 1H NMR (300 MHz, CDCl3); δ 8.33 (d, 2H), 8.12 (s, 1H), 7.97 (d, 1H), 7.78 (d, 2H), 7.52 (d, 2H), 7.38 (d, 2H), 6.92 (dd, 1H), 6.76 (d, 1H), 4.50 (t, 2H), 4.33 (t, 2H), 1.40 (s, 9H), 1.30 (s, 9H).

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