synthesis of 2′-deoxyisoguanosine (2), and the pyrrolo[2,3-d]pyrimidine and pyrazolo[3,4-d]pyrimidine 2′-deoxyribonucleosides 3 and 4 is described. Condensation of the imidazole precursor 5 with benzoyl isocyanate followed by reaction with ammonia gave 2. Its N(7) regioisomer was obtained from 6. Compound 2 was also prepared by the photochemically induced conversion of 2-Chloro- and 2-bromopurine 2′-deoxyribofuranosides
描述了2'-脱氧异鸟苷(2),吡咯并[2,3- d ]嘧啶和吡唑并[3,4- d ]嘧啶2'-脱氧核糖核苷3和4的合成。咪唑前体5与苯甲酰基异氰酸酯缩合,然后与氨反应,得到2。它的N(7)区域异构体是从6获得的。还通过分别在水溶液中将2-氯-和2-溴嘌呤2'-脱氧核糖呋喃糖苷9a和10进行光化学诱导的转化来制备化合物2,进一步将光反应用于化合物3的合成。和4分别从氨基-氯-2'-脱氧核苷9b和9c开始。
KAZIMIERCZUK, ZYGMUNT;SEELA, FRANK, LIEBIGS ANN. CHEM.,(1991) N, C. 695-697