scheme4
![Enantioselective synthesis of 6-(Indole-2-yl)-3,4-dihydropyran-2-one skeletons by <i>N</i>-Heterocyclic carbene-catalyzed asymmetric [3 + 3] cycloaddition of α-bromocinnamaldehyde](https://image.oaes.cc/40042901-1e86-452e-bbf6-921d534862d0/CS-2023-14.scheme.4.jpg)
Scheme 4. Proposed catalytic pathway and transition state.
Chemical Synthesis
ISSN 2769-5247 (Online)
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