反应详情

温度

0 °C

To a solution of Boc-(L)-tyrosine 5.0 g, 17.77 mmol) in N,N-dimethylformamide (40 ml) cesium carbonate (5.79 g, 17.77 mmol) was added. The reaction was cooled at 0° C. and a solution or 4-bromobutyl nitrate (17.77 mmol) in dichloromethane (20% w/w, 17.06 g) was added drop wise. The reaction was stirred at 0° C. for 20 minutes and then at room temperature for 22 hours. The mixture was poured into a 5% aqueous NaH2PO4 solution and extracted with diethyl ether (40×4 ml), the organic layers were dried over sodium sulfate and concentrated under reduced pressure. The residue was purified by flash chromatography (n-hexane/EtOAc from 9:1 to 1:1 as eluent affording the title compound.

1. waitat room temperature for 22 hours
2. extractionextracted with diethyl ether (40×4 ml)
3. dry with materialthe organic layers were dried over sodium sulfate
4. concentrationconcentrated under reduced pressure
5. customThe residue was purified by flash chromatography (n-hexane/EtOAc from 9:1 to 1:1 as eluent