Flash vacuum pyrolysis (FVP) of 1-(2-methoxycarbonylphenyl)pyrrole 2 at 925 °C (0.001 Torr) gives pyrrolo[2,1-a]isoindol-5-one 1 (79%) by a cascade process involving rate determining 1,5-aryl migration, elimination of methanol and electrocyclisation of the resulting ketene intermediate 3; the related heterocyclic systems 6, 9 and 12 were made by analogous methods.
H. McNab, S. Parsons and E. Stevenson, J. Chem. Soc., Perkin Trans. 1, 1999, 2047 DOI: 10.1039/A904885E
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