(S)-1-Boc-3-氨甲基哌啶   、                                                                                      
phenyl 3-ethyl-5-(1-methyl-1H-tetrazol-5-yl)phenylcarbamate                                                                                                                                                              在
                                                                                                                                                                                 
三乙胺                                                                                                                                  作用下,
                                                                                                                以
                                                                                         DMF (N,N-dimethyl-formamide)                                                                                  为溶剂,
                                                                                                                                                    反应 21.0h,
                                                                                                                以78%的产率得到(S)-3-{3-[3-Ethyl-5-(1-methyl-1H-tetrazol-5-yl)-phenyl]-ureidomethyl}-piperidine-1-carboxylic Acid Tert-butyl Ester