Issue 6, 2015

Ambient temperature synthesis of β,β′-fused nickel(ii) pyrrolo[1,2-a]pyrazinoporphyrins via a DBSA-catalyzed Pictet–Spengler approach

Abstract

A facile first synthetic strategy to construct novel π-extended β,β′-fused nickel(II) pyrrolo[1,2-a]pyrazinoporphyrins has been developed via a Pictet–Spengler reaction of newly prepared nickel(II) 2-amino-3-(pyrrol-1-yl)-5,10,15,20-tetraphenylporphyrin with various aromatic, aliphatic or heterocyclic aldehydes in the presence of 10 mol% p-dodecylbenzenesulfonic acid (DBSA) as an efficient Brønsted acid catalyst in 1,4-dioxane at 25 °C. A variety of these π-extended porphyrin analogues were obtained in moderate to good yields under mild conditions and characterized on the basis of spectral data and single crystal X-ray analysis.

Graphical abstract: Ambient temperature synthesis of β,β′-fused nickel(ii) pyrrolo[1,2-a]pyrazinoporphyrins via a DBSA-catalyzed Pictet–Spengler approach

Supplementary files

Article information

Article type
Paper
Submitted
08 Nov 2014
Accepted
27 Nov 2014
First published
01 Dec 2014

Org. Biomol. Chem., 2015,13, 1836-1845

Ambient temperature synthesis of β,β′-fused nickel(II) pyrrolo[1,2-a]pyrazinoporphyrins via a DBSA-catalyzed Pictet–Spengler approach

D. K. Singh and M. Nath, Org. Biomol. Chem., 2015, 13, 1836 DOI: 10.1039/C4OB02370F

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