Abstract 5′-O-Mesyl-2′, 3′-O-isopropylidene ribonucleosides (4 and 12) were converted to their 5′-substituted nucleosides in good yields by reacted with NaN3 or KI. 2′, 3′-O- Isopropylidene ribonucleosides (3 and 11) were prepared in good yields from ribonucleosides 1 and 2 with a reaction mixture of acetone and triethyl orthoformate instead of using acetone diethyl acetal. Compound 1 or 2 was treated with 2-acetoxyisobutyryl ...
[Kini, Ganesh D.; Henry, Elizabeth M.; Robins, Roland K.; Larson, Steven B.; Marr, J. Joseph; et al. Journal of Medicinal Chemistry, 1990 , vol. 33, # 1 p. 44 - 48]