Synthesis and NMR Spectra of Some New Carbohydrate Modified Uridine Phosphoramidites

Abstract

The one step reaction of 2′- and 3′-keto derivatives of uridine with bromodifluoromethyltris(dimethylamino)]phosphonium bromide and zinc gives the corresponding 2′- and 3′-difluoromethylene nucleosides in good yield. Desilylation and phosphitylation of the resultant 2′- or 3′-hydroxyls provides the target 2′- and 3′-phosphoramidites 7 and 8 for use in oligonucleotide synthesis¹.