scheme15
![Recent advances in organocatalytic cascade reactions for enantioselective synthesis of chiral spirolactone skeletons](https://image.oaes.cc/81dabbbc-923b-43d2-a26d-fe5689f6999d/5406.scheme.15.jpg)
Scheme 15. Organocascade 1,3-dipolar cycloaddition of 3-alkenyl-5-arylbutenolides 31 and N-2,2,2-trifluoroethylisatin ketimines 32. This figure is used with permission from the Royal Society of Chemistry[55].
Scheme 15. Organocascade 1,3-dipolar cycloaddition of 3-alkenyl-5-arylbutenolides 31 and N-2,2,2-trifluoroethylisatin ketimines 32. This figure is used with permission from the Royal Society of Chemistry[55].
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