scheme54

Scheme 54. Spirolactonization reaction of isatins 106 with α, β-unsaturated butenolides 109. This figure is used with permission from the Royal Society of Chemistry[131].
Scheme 54. Spirolactonization reaction of isatins 106 with α, β-unsaturated butenolides 109. This figure is used with permission from the Royal Society of Chemistry[131].
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