An efficient and concise method to synthesize locked GFP chromophore analogues

Soumit Chatterjee, Peter Karuso*

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    8 Citations (Scopus)


    A series of GFP analogues, which are fluorescent in the solid state at room temperature, but weakly fluorescent in solution, have been synthesized via an oxazolone formation process that involves a condensation reaction in the presence of a Lewis acid following a Knoevenagel condensation. A ring opened intermediate is formed which cyclizes readily upon heating to produce the imidazolinone. This method is faster, simpler and produces higher yields than alternative methods. A few analogues represent locked GFP derivatives where the exocyclic single bond rotation has been stopped. Weak fluorescence, even after stopping single bond rotation, indicates that restriction of conformation is not effectively controlled and that the double bond rotation is solely responsible for the major non-radiative pathway.

    Original languageEnglish
    Pages (from-to)5197-5200
    Number of pages4
    JournalTetrahedron Letters
    Issue number47
    Publication statusPublished - 23 Nov 2016


    • Fluorescence
    • Green Fluorescent Protein
    • HBDI
    • Knoevenagel condensation
    • Oxazolinone


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