Condensation of pyridone 6 with enal 25 using DMAP in EtOH at 150 degreesC
afforded 8% of the desired Diels-Alder adduct 22, 8% of the bridged adduct
36 and 1-2% of a partially pure cis-fused adduct 37 of unknown stereochemis
try. Hydroxylation of 22 completed a short synthesis of fusaricide (1).