The Diels–Alder reaction of in situ generated cyclohexa-1,3-dienes with methyl 4,4-diethoxybut-2-ynoate (1) followed by reverse Diels–Alder and hydrolysis affords substituted hydroxyphthalides in good yield.
J. Freskos, T. Cynkowski and J. S. Swenton, J. Chem. Soc., Chem. Commun., 1984, 819 DOI: 10.1039/C39840000819
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