Volume 2019, Issue 25 p. 4020-4033
Full Paper

Synthesis of Porphyrinoids, BODIPYs, and (Dipyrrinato)ruthenium(II) Complexes from Prefunctionalized Dipyrromethanes

Benjamin F. Hohlfeld

Benjamin F. Hohlfeld

Institut für Chemie und Biochemie, Freie Universität Berlin, Takustr. 3, 14195 Berlin, Germany

Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstr. 34/36, 14195 Berlin, Germany

biolitec research GmbH, Otto-Schott-Str. 15, 07745 Jena, Germany

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Keith J. Flanagan

Keith J. Flanagan

Medicinal Chemistry, Trinity Translational Medicine Institute, Trinity Centre for Health Sciences, Trinity College Dublin, The University of Dublin, St James's Hospital, 8 Dublin, Ireland

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Nora Kulak

Nora Kulak

Institut für Chemie und Biochemie, Freie Universität Berlin, Fabeckstr. 34/36, 14195 Berlin, Germany

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Mathias O. Senge

Mathias O. Senge

Medicinal Chemistry, Trinity Translational Medicine Institute, Trinity Centre for Health Sciences, Trinity College Dublin, The University of Dublin, St James's Hospital, 8 Dublin, Ireland

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Mathias Christmann

Mathias Christmann

Institut für Chemie und Biochemie, Freie Universität Berlin, Takustr. 3, 14195 Berlin, Germany

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Arno Wiehe

Corresponding Author

Arno Wiehe

Institut für Chemie und Biochemie, Freie Universität Berlin, Takustr. 3, 14195 Berlin, Germany

biolitec research GmbH, Otto-Schott-Str. 15, 07745 Jena, Germany

Institut für Chemie und Biochemie, Freie Universität Berlin, Takustr. 3, 14195 Berlin, Germany

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Dedicated to Professor Hans-Ulrich Reißig on the occasion of his 70th birthday
First published: 29 May 2019
Citations: 15

Graphical Abstract

The 3,4,5-trifluorophenyl and the 4-fluoro-3-nitrophenyl substituent were evaluated for modifying porphyrins, corroles, BODIPYs, and their dipyrromethane precursors via SNAr. Specifically, 5-(4-fluoro-3-nitrophenyl)dipyrromethane was efficiently substituted with amines. The prefunctionalized dipyrromethanes served as precursors for meso-substituted BODIPYs, dipyrrins, and their related RuII complexes.

Abstract

The introduction of functional groups into the meso-position of dipyrromethanes, boron-dipyrromethenes (BODIPYs) and porphyrinoids, is of fundamental importance in designing such dye systems for material sciences or photomedicine. One route that has proven to be particularly useful in this respect is the nucleophilic aromatic substitution (SNAr) on porphyrinoids and their precursors carrying electron-withdrawing substituents. To further expand this methodology, the potential of the 4-fluoro-3-nitrophenyl and the 3,4,5-trifluorophenyl moieties for the synthesis of functionalized dipyrromethanes, BODIPYs, and porphyrinoids has been evaluated. The 3,4,5-trifluorophenyl moiety proved not to be applicable in the SNAr with nucleophiles. The introduction of the 4-fluoro-3-nitrophenyl group, however, allowed fast and efficient SNAr with various amine nucleophiles. The synthesized 4-amino-3-nitrophenyl-substituted dipyrromethanes were successfully applied in the synthesis BODIPYs and were tested in the synthesis of “trans”-A2B2 porphyrins and A2B corroles. Furthermore, the dipyrromethanes – after oxidation to the dipyrromethenes – were found to be suitable ligands for metal ions giving access to functionalized ruthenium(II) metal complexes.