(Chemical Equation Presented) Four classes of phosphitylating reagents were subjected to reactions with aminomethyl polystyrene resin-bound p-acetoxybenzyl alcohol to yield the corresponding polymer-bound mono-, di-, tri-, and tetraphosphitylating reagents. The solid-phase reagents were reacted with unprotected nucleosides (e.g., thymidine, adenosine, 3′-azido-3′- deoxythymidine, cytidine, or inosine) in the presence of 5-(ethylthio)-1H- tetrazole. Polymer-bound nucleosides underwent oxidation with fert-butyl hydroperoxide, deprotection of cyanoethoxy groups with DBU, and the acidic cleavage, respectively, to afford 5′,5′-dinucleoside mono-, di-, tri-, and tetraphosphodiesters in 59-78% yield.
ASJC Scopus subject areas
- Molecular Medicine