4-benzhydryl-2-(3,4-dimethoxy-benzyl)-2-methyl-piperazine-1-carboxylic acid ethyl ester   、                                                                                      
Lithium aluminium hydride                                                                                                                                                              在
                                                                                                                                                                                 
hydron;2,4,5,6-tetrafluorobenzene-1,3-diamine;dichloride                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
四氢呋喃                                                                                  为溶剂,
                                                                                                                                                    反应 4.0h,
                                                                                                                以12.4 g (82 percent of theory) of 1-diphenylmethyl-3-methyl-3-(3,4-dimethoxybenzyl)-4-methyl-piperazine are obtained in the form of the dihydrochloride的产率得到4-benzhydryl-2-(3,4-dimethoxy-benzyl)-1,2-dimethyl-piperazine