反应详情

To a slurry of 4-carboxybutyl triphenylphosphonium bromide (4.1 g, 9.31 mmol) in THF (25 mL) at −10° C. under nitrogen atmosphere was added potassium tert-butoxide (2.1 g, 18.62 mmol). The mixture turned orange and after 10 minutes stirring, (R)-N,N-diisopropyl-3-(2-benzyloxy-5-formylphenyl)-3-phenylpropanamine (2 g, 4.65 mmol) in THF (10 mL) was added. After 4 hours of stirring, hydrochloric acid (1M) and diethyl ether were added and the layers were separated. The aqueous layer was extracted with ethyl acetate. The combined organic layers were dried (MgSO4) and the solvent was evaporated. The residue was chromatographed on silica (ethyl acetate-triethylamine 90:10 followed by methanol) to afford 3 g containing traces of triphenylphosphine. The product was used in the next step without further purification.

1. stirringAfter 4 hours of stirring
2. customthe layers were separated
3. extractionThe aqueous layer was extracted with ethyl acetate
4. dry with materialThe combined organic layers were dried (MgSO4)
5. customthe solvent was evaporated
6. customThe residue was chromatographed on silica (ethyl acetate-triethylamine 90:10 followed by methanol)
7. customto afford 3 g
8. customThe product was used in the next step without further purification