1-phenyl-2-(tetrahydropyrimidin-2(1H)-ylidene)ethan-1-one   、                                                                                      
2-(3-oxoisobenzofuran-1(3H)-ylidene)malononitrile                                                                                                                                                                                              以
                                                                                         
N,N-二甲基甲酰胺                                                                                  为溶剂,
                                                                                                                                                                                        以95%的产率得到6'-amino-9'-benzoyl-3-oxo-1',2',3',4'-tetrahydro-3H-spiro[isobenzofuran-1,8'-pyrido[1,2-a]pyrimidine]-7'-carbonitrile