One of the most promising approaches to the development of novel antiviral drugs is the synthesis of acyclic analogs of nucieosides. This approachto the synthesis of biologically active compounds was predicted over ten years ago [2], and has been confirmed by the discovery of such highly active antiviral drugs as 9-(4-hydroxy-2-oxa-butyl) guanine (acyclovir), 9-(4-hydroxy-3-hydroxymethyl-2-oxabutyl) guanine (BIOLF-62),(S)-9-(2, 3- ...