Site‐Selective γ‐Trihalomethylation and γ‐Dihalomethylidenation of Silyl Dienol Ethers under Organophotoredox Catalysis - Archive ouverte HAL
Article Dans Une Revue Chemistry - A European Journal Année : 2024

Site‐Selective γ‐Trihalomethylation and γ‐Dihalomethylidenation of Silyl Dienol Ethers under Organophotoredox Catalysis

Résumé

Abstract We report a general remote tribromo‐ and trichloromethylation process using CBr 4 and CBrCl 3 as ready available sources of trihalomethyl radicals. This method operates under mild and metal‐free photocatalyzed conditions and enables the access to γ‐trihalomethylated enals with complete regioselectivity in up to 71 % isolated yield. Importantly, this protocol is easily adapted to the selective one‐pot synthesis of the corresponding γ‐dihalomethylidenated enals in up to 49 % overall yield. Mechanistic studies are in favor of a radical chain propagation initiated by an oxidative quenching of the photocatalyst.

Domaines

Chimie

Dates et versions

hal-04833542 , version 1 (12-12-2024)

Identifiants

Citer

Camille Banoun, Flavien Bourdreux, Emmanuel Magnier, Guillaume Dagousset. Site‐Selective γ‐Trihalomethylation and γ‐Dihalomethylidenation of Silyl Dienol Ethers under Organophotoredox Catalysis. Chemistry - A European Journal, 2024, ⟨10.1002/chem.202403598⟩. ⟨hal-04833542⟩
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