scheme4
![Recent advances in organocatalytic cascade reactions for enantioselective synthesis of chiral spirolactone skeletons](https://image.oaes.cc/81dabbbc-923b-43d2-a26d-fe5689f6999d/5406.scheme.4.jpg)
Scheme 4. Regioselective catalytic asymmetric [3 + 2] cycloaddition of benzolactone-derived olefins 1 and two types of allenic esters 4 and 6. This figure is used with permission from the Royal Society of Chemistry[33].
Scheme 4. Regioselective catalytic asymmetric [3 + 2] cycloaddition of benzolactone-derived olefins 1 and two types of allenic esters 4 and 6. This figure is used with permission from the Royal Society of Chemistry[33].
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