scheme31
![Recent advances in organocatalytic cascade reactions for enantioselective synthesis of chiral spirolactone skeletons](https://image.oaes.cc/81dabbbc-923b-43d2-a26d-fe5689f6999d/5406.scheme.31.jpg)
Scheme 31. Organocatalytic annulation cascade reaction of α, β-unsaturated butenolides 62 and butyrolactone-derived cyclic imino esters 57. This figure is used with permission from the Royal Society of Chemistry[90].
Scheme 31. Organocatalytic annulation cascade reaction of α, β-unsaturated butenolides 62 and butyrolactone-derived cyclic imino esters 57. This figure is used with permission from the Royal Society of Chemistry[90].
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