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Condensation of pyridone 6 with enal 25 using DMAP in EtOH at 150°C 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 stereochemistry. Hydroxylation of 22 completed a short synthesis of fusaricide (1).
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Snider et al. (2001) studied this question.
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