Chlorotrimethylsilane → 2,3,5-tri-O-benzoyl-beta-L-ribofuranosyl pyrimidine

Participants

Reaction Steps

To a mixture of 1-O-acetyl-2,3,5-tri-O-benzoyl-β-L-ribofuranose (1 mol) and pyrimidine base (1 mol) in anhydrous MeCN are successively added HMDS (1 mol), ClSiMe3 (0.8 mol) and SnCl4 (1.2 mol). The resulting clear solution is refluxed for 1 hour when TLC indicates completion of the reaction. The solvent is evaporated and the residue dissolved in EtOAc, washed with NaHCO3 and H2O. The EtOAc layer is dried, filtered and evaporated to give the crude product, which is either crystallized or purified on a silica gel column to obtain the pure 2,3,5-tri-O-benzoyl-β-L-ribofuranosyl pyrimidine compounds. These compounds are stirred with NH3 /MeOH to give pure β-L-ribofuranosyl pyrimidines after purification and crystallization.

Provenance & Evidence