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Scheme 46. Spirolactonization reaction of 3-hydroxyoxindoles 69 with enals 91. This figure is used with permission from the Royal
Society of Chemistry [117] .
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] .
