2-<1-acetyl-2-(2-difluoromethoxyphenyl)ethenyl>-5,5-dimethyl-2-oxo-1,3,2-dioxaphosphorinane   、                                                                                      
3-氨基巴豆酸甲酯                                                                                                                                                                                              以
                                                                                         
异丙醇                                                                                  为溶剂,
                                                                                                                                                                                        以39%的产率得到4-(2-Difluoromethoxy-phenyl)-5-(5,5-dimethyl-2-oxo-2λ
5-[1,3,2]dioxaphosphinan-2-yl)-2,6-dimethyl-1,4-dihydro-pyridine-3-carboxylic acid methyl ester