Abstract
It was found by 1H, 13C and 15N NMR study that substitution of 4,9-dihydro-4, 6-dimethyl-9-oxo-3-(2′,3′,5′-tri-O-acetyl-β-D-ribofuranosyl) imidazo [1,2-a]purine (wyosine triacetate, 1) at C2 position with electronegative groups CH3O and C6H5CH2O results in a noticeable electron distribution disturbance in the “left-hand” imidazole ring and a significant increase in the North conformer population of the sugar moiety.
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