Treatment of 2,3-dihydro-1H-indol-3-ones with allyl alcohols in the presence of camphorsulfonic acid and magnesium sulfate at 130 °C gave, via condensation and a Claisen rearrangement, 2-allyl-2,3-dihydro-1H-indol-3-ones in good yields. The stereochemistry of the products was determined by NOE experiments.
T. Kawasaki, K. Masuda, Y. Baba, R. Terashima, K. Takada and M. Sakamoto, J. Chem. Soc., Perkin Trans. 1, 1996, 729 DOI: 10.1039/P19960000729
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