scheme47

Scheme 47. Spirolactonization reaction of 3-hydroxyoxindoles 69 with β, β-disubstituted enals 93. This figure is used with permission from the American Chemical Society[118].
Scheme 47. Spirolactonization reaction of 3-hydroxyoxindoles 69 with β, β-disubstituted enals 93. This figure is used with permission from the American Chemical Society[118].
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