Water → Tert-butyl 4-(4-chlorophenoxy)-2-(diphenylmethyleneamino)butanoate

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반응 단계

While under a nitrogen atmosphere, a solution of (benzhydrylidene-amino)-acetic acid tert-butyl ester (400 mg, 1.35 mmol) in tetrahydrofuran (7 mL) was cooled to −78° C. and treated with sodium bis(trimethylsilyl)amide (1.49 mL, 1.0 M in tetrahydrofuran, 1.49 mmol) in a dropwise manner. After the addition was complete, stirring was continued for 30 minutes and 1-(2-bromoethoxy)-4-chlorobenzene (398 mg, 1.69 mmol) was slowly added to the reaction mixture. Stirring was continued for 2 more hours, then slowly warmed to room temperature overnight. The resulting solution was poured into water, and extracted with ethyl acetate (3×). The combined organic phase was washed with saturated aqueous sodium chloride, dried over anhydrous magnesium sulfate, filtered and concentrated. Purification by flash column chromatography (silica gel, 0-20% ethyl acetate in heptane) gave tert-butyl 4-(4-chlorophenoxy)-2-(diphenylmethyleneamino)butanoate as a colorless oil (450 mg. 74%); MS (+CI): m/z for C27H28ClNO3: expected 449.2. found 450.2 (M+H)+, 394.2 (M+H−isobutene)+.

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