Coupling of 2',3'-isopropylideneadenosine (I) with N-Boc-methionine (II) by means of DCC provided ester (III). Subsequent deprotection of (III) under acidic conditions yielded the title compound.
The condensation between N-Boc-methionine (I) and O-(4-methoxybenzyl)hydroxylamine hydrochloride (II) gave the hydroxamate (III), which was then coupled with 2',3'-isopropylideneadenosine (IV) under Mitsunobu conditions to provide adduct (V). Subsequent deprotection with trifluoroacetic acid and anisole yielded the title compound.