Thermolysis of the 1a,1b,6b,6c-tetrahydro-azirino[2′,3′:3,4]cyclobuta[1,2-b][1]benzofurans (3) results in ring transformations to from the benzofuro[2,3-b]pyrroles (5) and their [3,2-b]-isomers (6).
J. Kurita, H. Sakai, S. Yamada and T. Tsuchiya, J. Chem. Soc., Chem. Commun., 1987, 285 DOI: 10.1039/C39870000285
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