二碳酸二叔丁酯   、                                                                                      
(S)-3-(4-Aminomethyl-5-hydroxy-6-methyl-pyridin-3-yl)-2-(9H-fluoren-9-ylmethoxycarbonylamino)-propionic acid                                                                                                                                                              在
                                                                                                                                                                                 
sodium carbonate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
1,4-二氧六环                                                                                  为溶剂,
                                                                                                                                                    反应 16.0h,
                                                                                                                以93%的产率得到(S)-3-[4-(tert-Butoxycarbonylamino-methyl)-5-tert-butoxycarbonyloxy-6-methyl-pyridin-3-yl]-2-(9H-fluoren-9-ylmethoxycarbonylamino)-propionic acid