Treatment of 2-allyl-1,2-dihydroindol-3-ones 1 with phosphonium ylides 2 in refluxing toluene gives 3-indole acetates 4 in good yields by tandem Wittig reaction and aromatization induced Cope rearrangement.
T. Kawasaki, K. Watanabe, K. Masuda and M. Sakamoto, J. Chem. Soc., Chem. Commun., 1995, 381 DOI: 10.1039/C39950000381
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