Acetic Anhydride → 4-Acetylamino-5-hydroxy-azepane-1-carboxylic acid benzyl ester

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Reaction Steps

3 mL acetic anhydride was added to 8.4 g benzyl 4-amino-5-hydroxy-azepane-1-carboxylic acid benzyl ester in 115 ml dichloromethane at 0° C. After 1 h at RT, saturated sodium bicarbonate was added. The phases were separated and the aqueous phase was extracted with dichloromethane. The combined organic phase was washed with brine, dried over sodium sulphate, filtered and concentrated. The residue was purified by chromatographie on silica gel (ethyl acetate/hexane 2:1) to yield 4.5 g of the desired product. (M+H)+: 307

Provenance & Evidence