3-Arylmethyleneindolin-2-ones react with carbonyl-stabilized sulphur ylides yielding spiro[cyclopropane-1,3′-indolin-2′-ones] whose structure and stereochemistry were assigned on the basis of spectroscopic data.
M. Chiericato, P. D. Croce and E. Licandro, J. Chem. Soc., Perkin Trans. 1, 1979, 211 DOI: 10.1039/P19790000211
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