4-Bromophenol → HCID 59243605, compound

Participants

Reaction Conditions

Reaction Steps

To a solution of 4-bromophenol (261 mg, 1.510 mmol) in acetonitrile (2 ml) under nitrogen, was added BEMP (397 μl, 1.373 mmol). The mixture was stirred at 50° C. for 30 minutes before being cooled to room temperature and (S)-5-bromo-2-tert-butoxycarbonylamino-pentanoic acid cyclopentyl ester (500 mg, 1.373 mmol) added as a solution in acetonitrile (2 ml). The reaction was heated at 50° C. for a further 1 hour and then the mixture was analysed by LCMS. The reaction was poured onto 2M Na2CO3 (100 ml) and extracted with EtOAc (2×100 ml). The combined organic layers were washed with 2M Na2CO3 (3×100 ml) and brine (100 ml), dried over magnesium sulphate, filtered and concentrated in vacuo to afford a colourless oil. MP-carbonate (1.0 g) was added to a solution of the crude product in dichloromethane (3.4 ml) and the solution was left overnight at room temperature. LCMS indicated complete removal of 4-bromophenol and so the reaction was filtered to remove the MP-carbonate and the resin was washed with DCM (2×50 ml). The filtrate was concentrated to afford the crude product which was purified by column chromatography eluting with 5% EtOAc in iso-hexane. Yield of title compound=435 mg, 0.953 mmol, 69.4% yield. m/z 456 and 458 [M+H]+.

Provenance & Evidence