The synthesis of 2, 3-dideoxy-3-C-(hydroxymethyl)-3-C-methyl-d-glycero-tetrofuranosyl nucleosides was accomplished in high enatiomeric purity (98.5% ee) via [3, 3]-sigmatropic Claisen rearrangement of (E)(S)-5-benzyloxy-1-tert-butyldimethylsilanyloxy-4-methyl-pent-3- en-2-ol prepared from 2, 3-O-isopropylidene-d-glyceraldehyde. The synthesized nucleosides were assayed against human immunodeficiency virus (HIV) and hepatitis B ...