3-[(S)-3-((S)-2-Benzyloxycarbonylamino-4-methyl-pentanoylamino)-2-hydroxy-pentanoylamino]-propionic acid benzyl ester                                                                                                                                                              在
                                                                                                                                                                                 2,2,6,6-tetramethyl-piperidine-N-oxyl   、                                                                                                  
sodium chlorite   、                                                                                                  potassium bromide                                                                                                                                  作用下,
                                                                                                                                                                                                                            以80%的产率得到3-[(S)-3-((S)-2-Benzyloxycarbonylamino-4-methyl-pentanoylamino)-2-oxo-pentanoylamino]-propionic acid benzyl ester