An anomalous conformation in a deoxyfluoro-sugar nucleoside
Abstract
The conformation of the carbohydrate portion in the nucleoside-methoxy-1-(3′,4′,6′-tri-O-acetyl-2′-deoxy-2′-fluoro-β-D-glucopyranosyl)-2(1H)-pyrimidone is the expected 4C1 but that in the α-anomer is intermediate between 1C4 chair and 2,4B or B2,5 boat conformations.