(2R,5S,6S)-5-amino-6-hydroxy-2-methyl-azepane-1-carboxylic acid benzyl ester hydrochloride 、
1-(N-叔丁氧羰基氨基)环己烷甲酸 在
N-甲基吗啉 、 O-(1H-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate 作用下,
以
DMF (N,N-dimethyl-formamide) 为溶剂,
以66%的产率得到(2R,5S,6S)-5-{[1-(1-tert-Butoxycarbonylamino-cyclohexyl)-methanoyl]-amino}-6-hydroxy-2-methyl-azepane-1-carboxylic acid benzyl ester