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Trifluoroacetic acid and benzenesulfonic acid in dichloromethane at ambient temperature have been found to be efficient co-catalysts for the epimerization of C-nucleosides with electron-withdrawing substituents. This approach provides a convenient route to the β anomer of the nucleosides with high yields in the range 54-78%. Synthesis of the 3'-phosphoramidite of 2,4-difluorophenyl C-nucleoside suitable...
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