3-Oxo-butyric acid 2-(benzyl-methyl-amino)-cyclohexyl ester                                                                                                                                                              在
                                                                                                                                                                                 
sodium methylate   、                                                                                                  
哌啶乙酸盐                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
异丙醇   、                                                                                         
苯                                                                                  为溶剂,
                                                                                                                                                                                        生成                                                 2-Amino-6-methyl-4-(3-nitro-phenyl)-1,4-dihydro-pyridine-3,5-dicarboxylic acid 5-[2-(benzyl-methyl-amino)-cyclohexyl] ester 3-(1-benzyl-piperidin-3-yl) ester