4-{[2-amino-7-(2-naphthylmethyl)-6-oxo-6,7-dihydro-3H-purin-3-yl]methyl}benzonitrile   、                                                                                      
叠氮化钠   、                                                                                      
氯化铵                                                                                                                                                              在
                                                                                                                                                                                 
2-amino-7-(2-naphthylmethyl)-3-[4-(1H-tetraazol-5-yl)benzyl]-3,7-dihydro-6H-purin-6-one                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
N,N-二甲基甲酰胺                                                                                  为溶剂,
                                                                                                                                                                                        以2-amino-7-(2-naphthylmethyl)-3-[4-(1H-tetraazol-5-yl)benzyl]-3,7-dihydro-6H-purin-6-one (compound 27) was obtained in 45% yield as a white solid的产率得到2-amino-7-(2-naphthylmethyl)-3-[4-(1H-tetraazol-5-yl)benzyl]-3,7-dihydro-6H-purin-6-one