A number of new pyrrolo[3,2-c]pyridine 2′-deoxynucleosides including 3,7-dideaza-2′-deoxyadenosine (1), 3,7-dideaza-2′-deoxyinosine (2), and 3,7-dideaza-2′-deoxynebularin (3) were synthesized from 4,6-dichloro-1-(2-deoxy-β-D-erythro-pentofuranosyl)-1 H- pyrrolo[3,2-c]pyridine(10). The latter was obtained stereoselectively via solid-liquid phase-transfer glycosylation1 of the nucleobase 7 with the halogenose 8. Compound 10 was converted into the pyrrolo[3,2-c]pyridine 2′,3′-dideoxyribofuranoside 14 via a four-step deoxygenation procedure. From compound 14, 3,7-dideaza-2′,3′-dideoxyadenosine (4) was obtained upon nucleophilic displacement of the 4-chloro substituent followed by reductive removal of the 6-chloro substituent. 3,7-Dideazapurine 2′-deoxynucleosides (1H-pyrrolo[3,2-c]pyridine 2′deoxynucleosides) are extremely stable against acid or base.
从4,6-二
氯-1-(2-脱氧-β-D-赤式-
呋喃戊糖基)-1H-
吡咯并[3,2-c]
吡啶(10)合成了许多新的
吡咯并[3,2-c]
吡啶2′-脱氧核苷,包括3,7-二脱氮-2′-脱氧
腺苷(1)、3,7-二脱氮-2′-脱氧
肌苷(2)和3,7-二脱氮-2′-脱氧
核糖素(3)。后者是通过核苷碱基7与卤代物8的固液相转移糖基化1,以立体选择性方式获得的。化合物10通过四步脱氧程序转化为
吡咯并[3,2-c]
吡啶2′,3′-二脱氧
呋喃核糖苷14。从化合物14出发,在4-
氯取代基发生亲核置换后,通过还原去除6-
氯取代基,获得了3,7-二脱氮-2′,3′-二脱氧
腺苷(4)。3,7-二脱氮
嘌呤2′-脱氧核苷(1H-��