Emission tuning of fluorescent kinase inhibitors: Conjugation length and substituent effects

Jyothi Dhuguru, Wenjun Liu, Walter G. Gonzalez, W. Michael Babinchak, Jaroslava Miksovska, Ralf Landgraf, James N. Wilson

Research output: Contribution to journalArticlepeer-review

18 Scopus citations


Fluorescent N-phenyl-4-aminoquinazoline probes targeting the ATP-binding pocket of the ERBB family of receptor tyrosine kinases are reported. Extension of the aromatic quinazoline core with fluorophore "arms" through substitution at the 6- position of the quinazoline core with phenyl, styryl, and phenylbutadienyl moieties was predicted by means of TD-DFT calculations to produce probes with tunable photoexcitation energies and excited states possessing charge-transfer character. Optical spectroscopy identified several synthesized probes that are nonemissive in aqueous solutions and exhibit emission enhancements in solvents of low polarity, suggesting good performance as turn-on fluorophores. Ligand-induced ERBB2 phosphorylation assays demonstrate that despite chemical modification to the quinazoline core these probes still function as ERBB2 inhibitors in MCF7 cells. Two probes were found to exhibit ERBB2-induced fluorescence, demonstrating the utility of these probes as turn-on, fluoroescent kinase inhibitors.

Original languageEnglish (US)
Pages (from-to)4940-4947
Number of pages8
JournalJournal of Organic Chemistry
Issue number11
StatePublished - Jun 6 2014

ASJC Scopus subject areas

  • Organic Chemistry


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