Oxabicyclo[7.2.1] enediyne 23 which contains an ortho-methoxybenzyl gr
oup at the anomeric position was synthesized from methyl-2,3-anhydro-a
lpha-D-lyxofuranoside (7). Treatment of this stable bicyclic enediyne
with ceric ammonium nitrate at room temperature in CH3CN/H2O gave the
aromatized monocyclic compound 25.