Abstract
Abstract The synthesis of 1-[4-deoxy-4-C-hydroxymethyl-α-L-lyxopyranosyl]thymine has been accomplished by two synthetic routes both starting from methyl 2, 3-O-isopropylidene-β-D-ribopyranoside. The first route makes use of a ring opening, ring closure reaction sequence to increase the proportion of the desired L-isomers. The second route utilizes the soft nucleophilic character of malonyl anions and ozonolytic cleavage of enol ether to introduce the branched chain. The newly obtained pyranosyl nucleoside obtains a 4C1 conformation with an equatorially oriented thymine moiety.
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