Photolytic ethylene addition to 3-methoxychromones 3a–cfurnished the 3-hydroxyoxetanes4a–c; reduction to the diols 5a–c followed by acid-catalysed rearrangement afforded the benzooxabicyclo[3.2.1]octanones 6a–cand bromination of 6c furnished7, which has previously been converted to filiformin 2.
A. Nath and R. V. Venkateswaran, J. Chem. Soc., Chem. Commun., 1993, 281 DOI: 10.1039/C39930000281
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