SCHEDULED MAINTENANCE
The Diels–Alder reaction of β-sulfonylnitroethylene with cyclopentadiene, cyclohexadiene or substituted anthracenes followed by treatment with ethyl isocyanoacetate in the presence of DBU gives pyrroles fused with bicyclo[2.2.1]heptadiene and bicyclo[2.2.2]octadiene skeletons, or triptycene-types of pyrrole, respectively, which are precursors for novel porphyrins fused with polycyclic skeletons.
S. Ito, T. Murashima and N. Ono, J. Chem. Soc., Perkin Trans. 1, 1997, 3161 DOI: 10.1039/A704418F
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