Silver-Catalyzed Regioselective 1,6-Hydroarylation of para-Quinone Methides with Anilines and Phenols

A simple and efficient method for the silver-catalyzed regioselective 1,6-hydroarylation of para-quinone methides (p-QMs) with anilines and phenols has been established. Without the need for pre-protection, a broad range of...

Iridium-Catalyzed Hydroalkylation of Aliphatic Alkenes with β-Ketoesters: Formal Hydroalkylation with Methyl Ketones

Transition-metal-catalyzed hydroalkylation of alkenes with 1,3-dicarbonyl compounds is a useful reaction to construct a C-C bond under neutral reaction conditions in a highly atom-economical manner. We found that hydroalkylation of aliphatic alkenes with β-ketoesters proceeded with the use of a cationic iridium complex and bidentate phosphine ligand to give selectively branched α-substituted β-ketoesters in high yields. The obtained hydroalkylated compounds can be converted to β-substituted ketones through one-pot Krapcho dealkoxycarbonylation.

Lewis Acid Catalyzed Transfer Hydromethallylation for the Construction of Quaternary Carbon Centers

The design and gram-scale synthesis of a cyclohexa-1,4-diene-based surrogate of isobutene gas is reported. Using the highly electron-deficient Lewis acid B(C6 F5 )3 , application of this surrogate in the hydromethallylation of electron-rich styrene derivatives provided sterically congested quaternary carbon centers. The reaction proceeds by C(sp3 )-C(sp3 ) bond formation at a tertiary carbenium ion that is generated by alkene protonation. The possibility of two concurrent mechanisms is proposed on the basis of mechanistic experiments using a deuterated surrogate.

Efficient hydroarylation and hydroalkenylation of vinylarenes by Brønsted acid catalysis

Brønsted acid Tf₂NH-catalyzed hydroarylation and hydroalkenylation of 4 vinylarenes under mild reaction conditions is herein shown to provide access to 1,1-diarylalkane scaffolds and trans-1,3-diaryl-1-butenes in high yields and with excellent regioselectivity.

Electrophilic phosphonium cations catalyze hydroarylation and hydrothiolation of olefins

Electrophilic phosphonium cations (EPCs) are efficient main group catalysts for the hydroarylation and hydrothiolations of olefins under mild conditions, providing a facile route to substituted aniline, bis-arylamine, phenol, furan, thiophene, pyrrole, indole and thioether derivatives.