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  • Title: A phosphine-catalyzed preparation of 4-arylidene-5-imidazolones.
    Author: Gabillet S, Loreau O, Specklin S, Rasalofonjatovo E, Taran F.
    Journal: J Org Chem; 2014 Oct 17; 79(20):9894-8. PubMed ID: 25238600.
    Abstract:
    A simple and efficient method for constructing 4-arylidene-5-imidazolones was developed using a phosphine-catalyzed tandem umpolung addition and intramolecular cyclization of amidine pronucleophiles on arylpropiolates. The reaction offers a robust route to heterocycle analogues of the fluorescent protein chromophores.
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