Chemoselective N-deacetylation of protected nucleosides and nucleotides promoted by Schwartz's reagent

Protection and deprotection strategies involving the N-acetyl group are widely utilized in nucleoside and nucleotide chemistry. Herein, we present a mild and selective N-deacetylation methodology, applicable to purine and pyrimidine nucleosides, by means of Schwartz's reagent, compatible with most of the common protecting groups used in nucleoside chemistry.

New analogs of acyclovir substituted at the side chain

A series of novel analogs of acyclovir, substituted with an alkyl (methyl, ethyl, n-butyl) or phenyl group at the positions 1', 4', and/or 5', has been obtained in a direct one-pot coupling reaction of guanosine and the respective 1,3-dioxolanes. The new acyclonucleosides were essentially inactive in antiviral (HSV, VV, VSV, HBV) evaluation in vitro.

Rearrangement reactions of 1,N2-isopropenoguanine cyclonucleosides

Under acid-catalyzed transglycosylation conditions 5',8-cyclo-8-oxo-1,N2-isopropenoguanine nucleosides (1, 10) undergo a ring-opening reaction to 8-oxo-1,N2-isopropenoguanosine derivatives (4, 11) followed by recyclization to fluorescent 5',3-cyclonucleosides (2, 12).

Rearrangement reactions of guanosine cyclonucleosides and their analogs

Under acid-catalyzed transglycosylation conditions 5',8-cyclo-8-oxoguanine nucleosides undergo a ring-opening reaction to 8-oxoguanine derivatives, instead of the 7-9 isomerization.

Synthesis and characterization of novel dipeptide ester prodrugs of acyclovir

Four dipeptide (Gly-Gly, Gly-Val, Val-Val, Val-Gly) ester prodrugs of 9-[(2-hydroxyethoxy)methyl]guanine (acyclovir, ACV) were synthesized. LC/MS was used to characterize the new prodrugs. Both 1H NMR and 13C NMR spectra of the four prodrugs of ACV were measured and assigned based on spectral comparison with compounds of similar structures.

Transglycosylation reactions of 6-thioguanine acyclonucleosides

9-(2-Acetoxyethoxy)methyl-N2-acetyl-6-thoguanine (2) undergoes two different transglycosylation reactions: i) the 7<=>9 isomerization, which gives the respective 7-regioisomer (3) as the major product, ii) the 9<=>S6 glycosyl migration, which leads to a 9,S6-disubstituted product (4). S6-Methylation completely stopped the reversibility of transglycosylation.