The 1-pyrrolyl fumarate (5), prepared by condensation of 1-hydroxypyrrole (1a) with trans-3-(methoxycarbonyl)-acryloyl chloride (4), undergoes a facile interamolecular Diels–Alder reaction to give the product (6), the first intramolecular cycloaddition of a pyrrole.
M. E. Jung and J. C. Rohloff, J. Chem. Soc., Chem. Commun., 1984, 630 DOI: 10.1039/C39840000630
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