A phosphine-catalyzed preparation of 4-arylidene-5-imidazolones.

Sandra Gabillet,Olivier Loreau,Simon Specklin,Evelia Rasalofonjatovo,Frédéric Taran

JOURNAL OF ORGANIC CHEMISTRY（2014）

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摘要

A simple and efficient method for constructing 4-arylidene-S-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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