A Phosphine-Catalyzed Preparation of 4-Arylidene-5-imidazolones
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.