crotyltriphenylphosphonium bromide   、                                                                                      
dimethyl 3-formyl-9-hydroxy-1-oxo-6,7-dihydro-2H-cyclopenta[g]isoquinoline-8,8-dicarboxylate                                                                                                                                                              在
                                                                                                                                                                                 
正丁基锂   、                                                                                                  
碘                                                                                                                                  作用下,
                                                                                                                                                                                                                            生成                                                    、                                                                                             dimethyl 9-hydroxy-1-oxo-3-[(1E,3E)-penta-1,3-dienyl]-6,7-dihydro-2H-cyclopenta[g]isoquinoline-8,8-dicarboxylate