(RS)-tert-butyl 9-[4-(2,6-dichlorobenzyloxy)benzyl]-7-(2,2,2-trichloroethoxycarbonylmethyl)-6,8,10-trioxo-1,7,9-triaza-spiro[4.5]decane-1-carboxylate                                                                                                                                                              在
                                                                                                                                                                                 ammonium acetate   、                                                                                                  
锌                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
四氢呋喃                                                                                  为溶剂,
                                                                                                                                                    反应 24.0h,
                                                                                                                以81%的产率得到(RS)-tert-butyl 7-carboxymethyl-9-[4-(2,6-dichlorobenzyloxy)benzyl]-6,8,10-trioxo-1,7,9-triaza-spiro[4.5]decane-1-carboxylate