European Journal of Organic Chemistry (2020)
Update date:2022-08-16
Topics:
Dehaen, Wim
Herdewijn, Piet
Mattelaer, Henri-Philippe
Van Hool, Anne-Sophie
Van Meervelt, Luc
Van der Auweraer, Mark
de Jong, Flip
Nucleosides with a bi(hetero)aryl nucleobase have unique potential applications as antiviral drugs and molecular probes. The need for transition metal catalysis to synthesize these nucleosides from pre-functionalized building blocks and the use of nucleobase protection groups results in expensive and tedious syntheses. Herein we report that 5-imidazolyl-uracil can be obtained by scalable Van Leusen imidazole synthesis and regioselectively introduced on ribose to obtain the desired nucleoside in a 5 step synthesis (total yield 55 percent). The 5-imidazolyl moiety leads to improved fluorescence properties. The only side-product formed was characterized by 2D-NMR and X-ray crystallography and could be suppressed during synthesis in favor of the desired product.
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