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Page 44 of 54                         Yang et al. Chem Synth 2023;3:7  https://dx.doi.org/10.20517/cs.2022.38


































                Scheme 58. Spirolactonization reaction of isatins 106 and α-branched indole 3-carboxaldehydes 117. This figure is used with permission
                from John Wiley and Sons Ltd [134] .






































                Scheme 59. Spirolactonization reaction of isatins 106 and α-branched indole 3-carboxaldehydes 119. This figure is used with permission
                                       [135]
                from the Royal Society of Chemistry  .
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