CC BY-NC-ND 4.0 · SynOpen 2020; 04(02): 44-50
DOI: 10.1055/s-0040-1707429
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A Modified Vilsmeier–Haack Strategy to Construct β-Pyridine-Fused 5,10,15,20-Tetraarylporphyrins

,
Mahendra Nath
Department of Chemistry, Faculty of Science, University of Delhi, Delhi-110 007, India   Email: mnath@chemistry.du.ac.in
› Author Affiliations
The authors are grateful to the University of Delhi for providing a DST PURSE grant. P.S. is grateful to UGC, New Delhi, India for the award of a Senior Research Fellowship.
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Publication History

Received: 31 March 2020

Accepted after revision: 06 May 2020

Publication Date:
08 June 2020 (online)


Abstract

A modified Vilsmeier–Haack strategy has been developed to construct a novel series of π-extended nickel(II) or copper(II) complexes of 2-chloro-3-formyl- and 3-formylpyrido[2,3-b]porphyrins from 2-acetamido-meso-tetraarylporphyrins. After chromatographic purification and spectral characterization, nickel(II) complexes of 2-chloro-3-formyl- and 3-formylpyrido[2,3-b]porphyrins underwent reaction with malononitrile under Knoevenagel conditions to afford new porphyrins with extended π-conjugation in appreciable yields. On photophysical investigation, the newly prepared pyridoporphyrins displayed a significant redshift in their electronic absorption spectra as compared to simple meso-tetraarylporphyrin precursors.

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