Ethyl Acetate → N,N'-Dicyclohexylurea

Participants

Reaction Steps

tert-Butyloxycarbonylaminoxy acetic acid was dissolved in ice-cooled ethyl acetate or acetonitrile and treated with N,N′-dicyclohexylcarbodiimide (1.0 equivalent) and N-hydroxysuccinimide (1.0 equivalent). The reaction mixture was stirred at room temperature overnight. The N,N′-dicyclohexylurea formed was removed by filtration and the filtrate was evaporated to dryness in vacuo. The crude Boc-AOA-OSu was either used directly in the next step or purified by recrystallisation from chloroform. Adopted from Kurth et al. J. Med. Chem. 1993, 36, 1255.

Provenance & Evidence