在
哌啶 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
生成 (2S,4S)-4-({(2R,4S)-4-Amino-1-[2-(5-methyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-acetyl]-pyrrolidine-2-carbonyl}-amino)-1-[2-(5-methyl-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-acetyl]-pyrrolidine-2-carboxylic acid methyl ester