1,2-Bisarylidenecyclobutanes, conveniently synthesized from the (cyclobut-1-enyl)triphenylphosphonium salt, diethyl lithiophosphonate, and aromatic aldehydes, readily undergo sequential Diels–Alder reactions with dienophiles to give good yields of polycyclic compounds.
T. Minami, Y. Taniguchi and I. Hirao, J. Chem. Soc., Chem. Commun., 1984, 1046 DOI: 10.1039/C39840001046
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