3(R)-benzyloxy-2-(2-tert-butoxycarbonylamino-2-methyl-propionyl-amino)-propionic acid 以
乙酸乙酯 为溶剂,
生成 (1-{1(R)-Benzyloxymethyl-2-[8a(S)-(4-fluoro-benzyl)-6-methylsulfanyl-8-oxo-3,4,8,8a-tetrahydro-1 H-pyrrolo[1,2-a]pyrazin-2-yl]-2-oxo-ethylcarbamoyl}-1-methyl-ethyl)-carbamic acid tert-butyl ester