The pyrano[3,4-b]pyrrol-5(1H)-ones (4) are stable cyclic analogues of 2,3-dimethylenepyrrole, and undergo Diels–Alder reaction with a range of acetylenes, or acetylene equivalents, to give, after loss of carbon dioxide, indoles.
P. M. Jackson and C. J. Moody, J. Chem. Soc., Perkin Trans. 1, 1990, 2156 DOI: 10.1039/P19900002156
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