scheme4
![Asymmetric [4+2] annulation of <i>N</i>-sulfonyl ketimines: access to <i>N</i>-heterocycles bearing 1,3-nonadjacent stereocenters with a quaternary carbon center](https://image.oaes.cc/22e1aeeb-06a0-4f29-a95f-f5f36830e38f/cs4058.scheme.4.jpg)
Scheme 4. Scale-up reaction and further synthetic transformation.
Chemical Synthesis
ISSN 2769-5247 (Online)
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