4-(2-tert-Butoxycarbonylamino-3-methyl-pentanoylamino)-4-(carbamoylmethyl-carbamoyl)-butyric acid 在
N,N'-羰基二咪唑 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以2%的产率得到{1-[2-(Carbamoylmethyl-carbamoyl)-5-oxo-pyrrolidine-1-carbonyl]-2-methyl-butyl}-carbamic acid tert-butyl ester