Treatment of 2′-hydroxychalcone with hydrazoic acid in trifluoroacetic acid gave flavanone, 2,3-dihydro-2-phenyl-1,4-benzoxazepin-5(4H)-one, 2-styrylbenzoxazole, (±)-trans-3-aminoflavanone, and isoflavone. The mechanism of the reaction is discussed.
S. Cacchi, G. Palmieri and D. Misiti, J. Chem. Soc., Perkin Trans. 1, 1976, 2371 DOI: 10.1039/P19760002371
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