Using Skipped Enynes in [3+3] Annulations with 4-Hydroxycoumarins:
Transformation under palladium/Brønsted-acid catalysis gives fused heterocycles
https://www.chemistryviews.org/using-skipped-enynes-in-33-annulations-with-4-hydroxycoumarins/

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Using Skipped Enynes in [3+3] Annulations with 4-Hydroxycoumarins - ChemistryViews

Transformation under palladium/Brønsted-acid catalysis gives fused heterocycles

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