Direct SNAr amination of fluorinated imidazo[4,5-c]pyridine nucleosides: efficient syntheses of 3-fluoro-3-deazaadenosine analogs
作者:Kandasamy Sakthivel、P. Dan Cook
DOI:10.1016/j.tetlet.2005.03.190
日期:2005.5
This paper describes the ready preparation of 3,6-difluoro-3-deazapurine (4,7-difluoroimidazo[4,5-c]pyridine). This novel base was glycosylated under mild conditions using three different ribose sugar analogs. 3,6-Difluoro-3-deazapurine ribonucleoside analogs underwent direct SNAr amination reactions with liquid ammonia to give 3-fluoro-3-deazaadenosine analogs in excellent yield; in contrast, 6-c
本文介绍了3,6-difluoro-3-deazapurine(4,7-difluoroimidazo [4,5- c ] pyridine)的制备方法。使用三种不同的核糖糖类似物在温和条件下将该新碱基糖基化。3,6-二氟-3-脱氮嘌呤核糖核苷类似物与液氨直接进行S N Ar胺化反应,以极好的收率得到3-氟-3-脱氮杂腺苷类似物。相反,在相似的反应条件下,6-氯-3-氟-3-脱氮嘌呤核苷是惰性的。