Study of the addition of Grignard reagents to 2-aryl-3H-indol-3-ones

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.