Cycloaddition of dimethyl fumarate, trans-1,2-dibenzoylethylene, dimethyl maleate, and maleic anhydride to the benzene nucleus of (1) afforded (2a), (2b), (5a), and (5b), respectively.
F. Toda and K. Tanaka, J. Chem. Soc., Chem. Commun., 1976, 177 DOI: 10.1039/C39760000177
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