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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


































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                 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] .
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