Water → 3-Dibenzylamino-2,6-difluoro-benzoic acid benzyl ester

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To a solution of dibenzyl-(2,4-difluoro-phenyl)-amine (17.5 g, 0.056 mol) in THF (140 mL), under nitrogen atmosphere, cooled at −78° C., n-butyllithium (1.6 M in hexane, 38 mL, 0.06 mol) was slowly added. The reaction was stirred for 1 hour, and then quickly added via a cannula to a solution of benzyl chloroformate (11.78 mL, 0.084 mol) in THF (140 mL) previously cooled at −78° C. The reaction was then allowed to warm to room temperature, poured into water and extracted with ethyl acetate. The organic layer was washed with brine, dried over anhydrous sodium sulfate and filtered. The filtrate was concentrated and purified by silica gel column chromatography eluting with 5% ethyl acetate in hexane grading to 10% acetate (quant.).

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