Synthesis and Biological Evaluation of Methylenecyclopropane Analogues of Nucleosides

Abstract

Starting from a chiral methylenecyclopropane building block, readily obtained by enzymatic desymmetrization of a meso-diol, two types of methylenecyclopropane analogues of nucleosides were synthesized. The first type of nucleosides was obtained from the direct coupling of the chiral building block with 6-chloropurine under Mitsunobu reaction conditions followed by the functionalization of the purine base. The second type of nucleosides featured a Curtius rearrangement as the key step and the uracil heterocycle was then constructed by a linear methodology. These derivatives were evaluated as potential agents against important viral pathogens. None of the new compounds had significant antiviral activity at a concentration of 100 μg/mL, which was the highest concentration tested.

Key words

stereoselective synthesis - Curtius rearrangement - carbocyclic nucleosides - methylenecyclopropane carbonucleosides - antiviral agents

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