溶剂黄146 、 (S)-2-[(S)-2-Amino-3-(4-fluoro-phenyl)-propionylamino]-3-methyl-butyric acid methyl ester; compound with trifluoro-acetic acid 在
O-(1H-benzotriazol-1-yl)-N,N,N',N'-tetramethyluronium hexafluorophosphate 、
N,N-二异丙基乙胺 作用下,
以64%的产率得到(S)-2-[(S)-2-Acetylamino-3-(4-fluoro-phenyl)-propionylamino]-3-methyl-butyric acid methyl ester