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Yang et al. Chem Synth 2023;3:7 https://dx.doi.org/10.20517/cs.2022.38 Page 45 of 54
[137]
Scheme 60. Spirolactonization reaction of enals 121 and isatins 106. This figure is used with permission from Wiley-VCH Verlag .
Scheme 61. Spirolactonization reaction of isatins 106 and unsaturated acyl chlorides 123. This figure is used with permission from
Wiley-VCH Verlag [138] .