反应详情

To a stirred solution of tert-butyl 2-((diphenylmethylene)amino)acetate (1 g, 3.39 mmol) in THF (20 mL) cooled to −78° C. under nitrogen atmosphere was added a 2M solution of LDA in THF (2.54 mL, 5.08 mmol) dropwise for 30 min. To this mixture was then added 3,3,3-trifluoropropyl trifluoromethanesulfonate (1.083 g, 4.40 mmol). The reaction was gradually warmed to rt and stirred for 4 h. The reaction mixture was quenched by addition of saturated aqueous ammonium chloride at 0° C. The reaction mixture was then extracted with ethyl acetate (3×10 mL). The combined organic extracts were washed with water (1×10 mL) and brine (1×10 mL), dried over sodium sulfate and then concentrated under reduced pressure. The crude oil was purified by silica gel column chromatography (2% ethyl acetate in hexane) to afford tert-butyl 2-((diphenylmethylene)amino)-5,5,5-trifluoropentanoate (800 mg, 2.02 mmol, 60% yield) as a yellow oil. LC/MS (ESI) m/e 391.9 [(M+H)+, calcd for C22H25F3NO2, 392.2]; LC/MS retention time (method E): tR=2.49 min.

1. customThe reaction mixture was quenched by addition of saturated aqueous ammonium chloride at 0° C
2. extractionThe reaction mixture was then extracted with ethyl acetate (3×10 mL)
3. washThe combined organic extracts were washed with water (1×10 mL) and brine (1×10 mL)
4. dry with materialdried over sodium sulfate
5. concentrationconcentrated under reduced pressure
6. customThe crude oil was purified by silica gel column chromatography (2% ethyl acetate in hexane)