Amination of cinnolin-3-one with hydroxylamine-O-sulphonic acid gives 2-aminocinnolin-3-one which undergoes a novel rearrangement to oxindole; similar treatment of 1,2,4-triazine-3-ones gives high yields of the analogous ring-contracted products, imidazolin-2-ones, directly.
C. W. Rees and A. A. Sale, J. Chem. Soc. D, 1971, 531 DOI: 10.1039/C29710000531
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