名称:
                                Nucleosides and Nucleotides. 130. The Synthesis of Imidazo[4, 5-e][1, 4] Diazepine Nucleosides FromN1-Substituted Inosines
                             
                            
                                摘要:
                                New synthetic methods for pyrimidine ring-expanded xanthosine, guanosine, and inosine analogues containing imidazo[4,5-e][1,4]diazepine nucleus are described. Treatment of N-1-substituted inosine derivatives 5, 12, 19 with aqueous NaOH gave 5-amino-4-(N-substituted carbamoyl)imidazole derivatives, followed by appropriate manipulations to cyclize these to constitute imidazo[4,5-e][1,4]diazepine nucleosides 11, 17, 22.