scheme13
![Recent advances in organocatalytic cascade reactions for enantioselective synthesis of chiral spirolactone skeletons](https://image.oaes.cc/81dabbbc-923b-43d2-a26d-fe5689f6999d/5406.scheme.13.jpg)
Scheme 13. Domino 1,3-dipolar cycloaddition of butyrolactones/valerolactones 27, ninhydrin 28 and proline or thioproline 29. This figure is used with permission from the Royal Society of Chemistry[54].
Scheme 13. Domino 1,3-dipolar cycloaddition of butyrolactones/valerolactones 27, ninhydrin 28 and proline or thioproline 29. This figure is used with permission from the Royal Society of Chemistry[54].
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