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A preparation method was developed for 1-aryl-2,4-disubstituted imidazol-5-ones from N-benzoyla,b-dehydrophenylalanine anilides or 2-phenyl-4-benzylidene-5-oxazolone and arylamine in the presence of trimethylchlorosilane.Dehydration of amides of N-substituted a,b-dehydro amino acids can result in 2-imidazolin-5-ones formation [1], and the trimethylchlorosilane can be used as dehydrating agent [25].This paper concerns the study of a reaction between N-substituted a,b-dehydrophenylalanine arylamides (I V) and trimethylchlorosilane.

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