Grignard reagents are added to the carbonyl group of 2-aryl-3H-indol-3-ones to generate 3-alkyl(or phenyl)-2-aryl-3H-indol-3-ols, which are in turn rearranged to yield 2-alkyl(or phenyl)-2-aryl-1,2-dihydro-3H-indol-3-ones.
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Liu et al. (2003) studied this question.
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