Keywords
azlactone
Erlenmeyer-Plöchl reaction
oxindole
ultrasound
Abstract
4-(2-Oxoindolin-3-ylidene)-2-phenyl-5(4H)-oxazolone (azlactone) was synthesized as a mixture of E- and Z-isomers by ultrasound-assisted Erlenmeyer–Plöchl reaction between isatin and N-benzoylglycine. Treatment of azlactone with nucleophiles causes opening of its oxazolone moiety.
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