Issue 2, 2025

In(OTf)3-catalysed A3-annulation strategy towards the synthesis of pyrazole-tethered quinoline derivatives and assessment of their luminescent properties

Abstract

An In(OTf)3-catalysed approach has been devised for the synthesis of fluorescent pyrazole-tethered quinoline derivatives via the A3-coupling of 4-formyl-pyrazole-3-carboxylates, substituted aromatic amines and terminal alkynes. This strategy offers several advantages, including the use of readily available and inexpensive starting materials, broad substrate scope, sustainable reaction conditions and high product yields. This strategy is amenable to gram-scale synthesis, and the scope of this methodology was demonstrated for the synthesis of a library of 32 novel pyrazole-tethered quinoline derivatives, with yields up to 96%. The photophysical properties of these pyrazole-tethered quinolines were estimated and excellent results were obtained with a quantum yield (ΦF) of up to 75%.

Graphical abstract: In(OTf)3-catalysed A3-annulation strategy towards the synthesis of pyrazole-tethered quinoline derivatives and assessment of their luminescent properties

Supplementary files

Article information

Article type
Paper
Submitted
21 Sep 2024
Accepted
21 Nov 2024
First published
22 Nov 2024

New J. Chem., 2025,49, 418-429

In(OTf)3-catalysed A3-annulation strategy towards the synthesis of pyrazole-tethered quinoline derivatives and assessment of their luminescent properties

R. Jamra, C. C. Malakar, S. Khullar and V. Singh, New J. Chem., 2025, 49, 418 DOI: 10.1039/D4NJ04130E

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