7-Methoxy-4-methyl-1-tetralone   、                                                                                      
N,N-二甲基甲酰胺二乙基缩醛                                                                                                                                                              在
                                                                                                                                                                                 
3,4-dihydro-2-dimethylaminomethylene-7-methoxy-4-methyl-1(2H) naphthalenone   、                                                                                                  silica   、                                                                                                  
乙酸乙酯   、                                                                                                  
ethyl acetate n-hexane                                                                                                                                  作用下,
                                                                                                                                                                                                                            以to give 3,4-dihydro-2-dimethylaminomethylene-7-methoxy-4-methyl-1(2H) naphthalenone as a yellow oil (920 mg)的产率得到3,4-dihydro-2-dimethylaminomethylene-7-methoxy-4-methyl-1(2H) naphthalenone