scheme12
![Recent advances in organocatalytic cascade reactions for enantioselective synthesis of chiral spirolactone skeletons](https://image.oaes.cc/81dabbbc-923b-43d2-a26d-fe5689f6999d/5406.scheme.12.jpg)
Scheme 12. α, β-unsaturated butyrolactones/valerolactones 27 as 2C synthons for construction of spirobutyrolactone/valerolactones.
Scheme 12. α, β-unsaturated butyrolactones/valerolactones 27 as 2C synthons for construction of spirobutyrolactone/valerolactones.
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