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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 .