scheme21
![Recent advances in organocatalytic cascade reactions for enantioselective synthesis of chiral spirolactone skeletons](https://image.oaes.cc/81dabbbc-923b-43d2-a26d-fe5689f6999d/5406.scheme.21.jpg)
Scheme 21. Organocatalyzed tandem reaction of benzolactone-chromone 4C synthons 42 with benzolactone-derived olefins 1. This figure is used with permission from Elsevier[64].
Scheme 21. Organocatalyzed tandem reaction of benzolactone-chromone 4C synthons 42 with benzolactone-derived olefins 1. This figure is used with permission from Elsevier[64].
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