Abstract
N -[2-(Alkylamino)-1-(2-azidophenyl)-2-oxoethyl]- N -(3-oxoprop-1-en-2-yl)amides, obtained from the Ugi reaction of a vinyliminophosphorane, 2-azidobenzaldehyde, a carboxylic acid, and an alkyl isocyanide, reacted with triphenylphosphine to give various 3-arylidene-3 H -1,4-benzodiazepine in good yields via sequential Staudinger and intramolecular aza-Wittig reaction.
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