scheme19
![Recent advances in organocatalytic cascade reactions for enantioselective synthesis of chiral spirolactone skeletons](https://image.oaes.cc/81dabbbc-923b-43d2-a26d-fe5689f6999d/5406.scheme.19.jpg)
Scheme 19. Organocatalytic enantioselective double-Michael addition reaction of benzofuranones 36 and divinyl ketones 39. This figure is used with permission from John Wiley and Sons Ltd[61].
Scheme 19. Organocatalytic enantioselective double-Michael addition reaction of benzofuranones 36 and divinyl ketones 39. This figure is used with permission from John Wiley and Sons Ltd[61].
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