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Higher-Order [10 + 2] Annulation Strategy for the Synthesis of CF3-Functionalized Benzopentalenes
Jaggaraju Prudhviraj1,2, Chavakula Nagababu1,2, Jagadeesh Babu Nanubolu2,3
1Fluoro-Agro Chemicals Division, CSIR-Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad 500007, India.
This study introduces a new reaction for creating trifluoromethylated benzopentalenes using indene-2-carbaldehydes and palladium complexes. This method provides efficient access to complex fluorinated polycycles with high selectivity.
Area of Science:
- Organic Chemistry
- Synthetic Chemistry
- Fluorine Chemistry
Background:
- Palladium-catalyzed reactions are crucial in organic synthesis.
- Trifluoromethyl (CF3) groups enhance molecular properties.
- Benzopentalenes are complex polycyclic structures.
Purpose of the Study:
- To develop a novel higher-order [10 + 2] annulation strategy.
- To synthesize CF3-functionalized benzopentalenes.
- To explore new reactivity of palladium complexes.
Main Methods:
- Utilizing indene-2-carbaldehydes as starting materials.
- Employing CF3-π-allyl-palladium complexes.
- Investigating the reaction mechanism involving isobenzofulvene intermediates.
Main Results:
- Achieved concise access to CF3-functionalized benzopentalenes.
- Demonstrated an unprecedented annulation pathway.
- Obtained products with excellent diastereoselectivity.
Conclusions:
- This work presents the first higher-order annulation with CF3-π-allyl-Pd species.
- Expands synthetic utility of indene-derived polyenolates.
- Enables efficient synthesis of fluorinated polycycles.
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