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Issue 37, 2020
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Synthesis of 2-bromo- and 2-phenyl-neo-confused porphyrins

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Neo-confused porphyrins (neo-CPs), porphyrin isomers with a 1,3-connected pyrrolic subunit, are aromatic structures with a CNNN coordination core. Previously, examples of neo-CPs with fused benzo units or electron-withdrawing ester substituents have been described. In this paper, two new examples of neo-CPs are reported that lack a fused aromatic unit or an ester moiety, but instead have a bromo or phenyl substituent on the neo-confused ring. Acid-catalyzed condensation of suitably substituted 1,2′-dipyrrylmethane dialdehydes with a 2,2′-dipyrrylmethane, followed by oxidation with aqueous ferric chloride solutions, afforded the neo-CPs in 40–45% yield. These porphyrin analogues had slightly reduced diatropic ring currents and slowly decomposed in solution. The related palladium(II) and nickel(II) complexes proved to be very unstable, even though the diatropicity of the macrocycle was enhanced. This study shows that stabilizing substituents are necessary for investigations into this class of porphyrinoids. Attempts to prepare imidazole versions of neo-CPs were unsuccessful.

Graphical abstract: Synthesis of 2-bromo- and 2-phenyl-neo-confused porphyrins

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Article information

07 Aug 2020
01 Sep 2020
First published
02 Sep 2020

Org. Biomol. Chem., 2020,18, 7336-7344
Article type

Synthesis of 2-bromo- and 2-phenyl-neo-confused porphyrins

A. S. Almejbel and T. D. Lash, Org. Biomol. Chem., 2020, 18, 7336
DOI: 10.1039/D0OB01642J

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