diethyl (1RS,6RS)-2-oxabicyclo[4.2.0]octane-8,8-dicarboxylate   、                                                                                      [1-(3-Ethoxy-4-methoxy-phenyl)-meth-(E)-ylidene]-phenyl-amine                                                                                                                                                              在
                                                                                                                                                                                 
ytterbium(III) triflate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                                                        以0.21 g的产率得到diethyl 2-(3-ethoxy-4-methoxyphenyl)-5-(3-hydroxypropyl)-1-phenyl-1,2-dihydropyridine-3,3(4H)-dicarboxylate