E. Kawashima et al., HIGHLY DIASTEREOSELECTIVE SYNTHESIS OF (2'S)-[2'-H-2]-2'-DEOXYRIBONUCLEOSIDES FROM THE CORRESPONDING RIBONUCLEOSIDES, Nucleosides & nucleotides, 14(3-5), 1995, pp. 333-336
The four (2'S)-[2'-H-2]-2'-deoxynucleosides (>90 atom % H-2),,ere synt
hesized from the corresponding ribonucleosides involving six steps of
reactions, i.e., oxidation of their 2'-hydroxyl group, stereoselective
reductive deuteration of the resulting 2'-ketonucleoside intermediate
s with (NaBH4)-H-2 in EtOH-H2O or EtOH, triflation, bromination with L
iBr, highly stereoselective Bu(3)SnH-Et(3)B reduction of the resulting
bromide, and, finally, unmasking.