The crowned benzoquinone (1), prepared from pyrogallol in four steps, undergoes Diels–Alder reactions with cyclopentadiene and thebaine to give good yields of the respective adducts containing the crown ether moiety.
K. Hayakawa, K. Kido and K. Kanematsu, J. Chem. Soc., Chem. Commun., 1986, 268 DOI: 10.1039/C39860000268
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