title: Solid-phase synthesis of symmetrical 5',5'-dinucleoside mono-, di-, tri-, and tetraphosphodiesters.
abstract: 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 tert-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.
authors.affiliation: Department of Biomedical and Pharmaceutical Sciences, College of Pharmacy, The University of Rhode Island, Kingston, Rhode Island 02881, USA.
authors.forename: Yousef
authors.initials: Y
authors.lastname: Ahmadibeni
authors.forename: Keykavous
authors.initials: K
authors.lastname: Parang
mesh_terms: D004952:Esters / Q000138:chemical synthesis; D015394:Molecular Structure; D009705:Nucleosides / Q000138:chemical synthesis*
chemical_list: D004952:Esters; D009705:Nucleosides