Synthesis of 2-amino-9-(3′-azido-2′,3′-dideoxy-beta-D-erythro-pentofuranosyl)-6-methoxy-9H-purine (AzddMAP) and AzddGuo

A novel synthesis of AzddMAP and AzddGuo is described starting from 1, 2-O-isopropylidene-alpha-D-xylofuranose. The key step in this synthesis involves the replacement of a diphenyl carbamoyl protecting group in the purine 6-position by methanol.