A Simple, Preparative Procedure forN3-Anisoyluridine andO6-Diphenylcarbamoylguanosine 2′-O-(Tetrahydropyran-2-YL) DerivativesviaThe Corresponding 3′,5′-Dibenzoates

Abstract
3′,5′-Di-O-benzoyl-2′-O-(tetrahydropyran-2-yl)uridine and 3′,5′ -di-O-benzoyl-N 2-isobutyryl-2′-O-(tetrahydropyran-2-yl)guanosine are converted into-N 3-anisoyl-2′-O-(tetrahydropyran-2-yl)uridine (less and more polar diastereoisomers in 37% and 42% yields, respectively) and O 6-diphenyl carbamoylN 2-isobutyryl-2′-O-(tetrahydropyran-2-yl)- guanosine (less and more polar diastereoisomers in 15% and 59% yields, respectively), respectively, by N 3-anisoylation and O 6-diphenylcarbamoylation, followed by 3′,5′-di-O-debenzoylation.

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