(R)-1-[[3-[2-[(R)-2-tert-butoxycarbonyl-pyrrolidin-1-yl]-2-oxo-ethyl]-1,3-dibutyl-ureido]-acetyl]-pyrrolidine-2-carboxylic acid tert-butyl ester 以
三氟乙酸 为溶剂,
反应 4.0h,
以to give 167 mg (74%) of the title compound as brown foam的产率得到(R)-1-[[3-[2-[(R)-2-carboxy-pyrrolidin-1-yl]-2-oxo-ethyl]-1,3-dibutyl-ureido]-acetyl]-pyrrolidine-2-carboxylic acid