Journal
CHINESE JOURNAL OF CHEMISTRY
Volume 41, Issue 8, Pages 909-914Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cjoc.202200695
Keywords
Palladium; Phosphane ligands; Chemoselectivity; Desulfurization; Polyhalogenated aryl triflates
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This paper presents the first examples of palladium-catalyzed desulfinative cross-coupling reaction of polyhalogenated aryl triflates with aryl sulfinate salts. The catalyst system exhibited excellent reactivity and chemoselectivity in this reaction, which had a wide substrate scope and provided a simple method for constructing functionalized biaryl motifs. The interaction between the indolyl phosphine ligand and the Pd center played a key role in the reactivity and chemoselectivity of this reaction.
This paper presents the first general examples of palladium-catalyzed desulfinative cross-coupling reaction of polyhalogenated aryl triflates with aryl sulfinate salts showing an inversion of the conventional reactivity order of C-Br > C-Cl > C-OTf. The catalyst system, comprising of Pd(OAc)(2) and tBuPhSelectPhos, exhibited excellent catalytic reactivity and chemoselectivity toward this reaction. This reaction had a wide range of substrate scopes and provided a simple and efficient method for the construction of functionalized biaryl motifs. Notably, the C-H & BULL;& BULL;& BULL;Pd interaction from the methine hydrogen of the C2-cyclohexyl group of the indolyl phosphine ligand with the Pd center may contribute a key factor in reactivity and chemoselectivity. Assisting with density functional theory (DFT) calculations, the results revealed that the oxidative addition step in this reaction was a controlling-chemoselectivity step. [GRAPHICS]
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