The reaction of isatin 1 (2,3-dihydroindole-2,3-dione) and triphenylphosphine 2 afforded the new title compound 6 and isoindigo 7 and not the earlier proposed indirubin 3. Wittig reactions of 6 with the benzaldehydes 8a–c gave the corresponding (Z-)- and (E)-3-(arylmethylidene)-2, 3-dihydro-1H-indol-2-ones 9a–c and 10a–c, respectively, in moderate yields.
G. E. Lathourakis and K. E. Litinas, J. Chem. Soc., Perkin Trans. 1, 1996, 491 DOI: 10.1039/P19960000491
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