Abstract
Vinyl azides, obtained from the Ugi-type reaction of 2-azido-3-arylacrylic acid, secondary amine, aldehyde, and isocyanide, react with triphenylphosphine to give a variety of 4-arylidene-1H-imidazol-5(4H)-ones in high yields via sequential Staudinger and intramolecular aza-Wittig reaction.
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