巴比妥酸   、                                                                                      
4-(3-(1,3-dimethyl-2,6-dioxo-1,2,3,6-tetrahydro-7H-purin-7-yl)propoxy)benzaldehyde   、                                                                                      
3-氨基苯酚                                                                                                                                                              在
                                                                                                                                                                                 tungstic acid supported on silica coated magnetic nanoparticles                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙醇                                                                                  为溶剂,
                                                                                                                                                    反应 3.0h,
                                                                                                                以80%的产率得到5-(4-(3-(1,3-dimethyl-2,6-dioxo-1,2,3,6-tetrahydro-7H-purin-7-yl)propoxy)phenyl)-10-(3-hydroxyphenyl)-5,10-dihydropyrido[2,3-d:6,5-d']dipyrimidine-2,4,6,8(1H,3H,7H,9H)-tetraone