Ruthenium(II)-Catalyzed meta C-H Mono- and Difluoromethylations by Phosphine/Carboxylate Cooperation

Ruthenium(II)-catalyzed meta-selective C-H (di)fluoromethylation was accomplished by phosphine and carboxylate cooperation. The remote C-H functionalization was characterized by ample substrate scope, thereby setting the stage for meta-(di)fluoromethylation through facile C-H cleavage.

Palladium-Catalyzed, ortho-Selective C-H Halogenation of Benzyl Nitriles, Aryl Weinreb Amides, and Anilides

A palladium-catalyzed, ortho-selective C-H halogenation methodology is reported herein. The highlight of the work is the highly selective C(sp²)-H functionalization of benzyl nitriles in the presence of activated C(sp³)-H bond, which results in good yields of the halogenated products with excellent regioselectivity. Along with benzyl nitriles, aryl Weinreb amides and anilides have been evaluated for the transformation using aprotic conditions. Mechanistic studies yield interesting aspects with respect to the pathway of the reaction and the directing group abilities.

Recent advances in positional-selective alkenylations: removable guidance for twofold C–H activation

Recent advances in transition-metal catalyzed positional-selective alkenylations via twofold C–H activation directed by removable or traceless directing groups are reviewed.

Ruthenium-catalyzed meta-selective C–H sulfonation of azoarenes with arylsulfonyl chlorides

Ruthenium-catalyzed meta-selective C–H sulfonation of azoarenes with arylsulfonyl chlorides via a five-membered ruthenacycle complex.

Transition metal-catalyzed site- and regio-divergent C–H bond functionalization

The regioselectivity of C–H functionalization reactions can be redirected to obtain regioisomeric products form the same starting materials.

α-Halo carbonyls enable meta selective primary, secondary and tertiary C–H alkylations by ruthenium catalysis

A catalytic meta selective C–H alkylation of arenes is described using a wide range of α-halo carbonyls as coupling partners.

Remote meta C–H bond functionalization of 2-phenethylsulphonic acid and 3-phenylpropanoic acid derivatives

This discovery illustrates selective meta C–H bond activation from multiple non-equivalent C–H bonds present in medicinally relevant arylethanesulfonic acid and the 2-arylpropanoic acid moiety using weakly coordinating nitrile as a directing group.

Palladium catalysed meta-C–H functionalization reactions

The directing group assisted site selective C–H functionalization approach is having a continuous impact in the field of natural product synthesis, drug discovery and material sciences.

Highly regioselective meta arylation of oxalyl amide-protected β-arylethylamine via the Catellani reaction

A first bidentate directing group assisted highly selective meta arylation of β-arylethylamine derivatives with various iodides is reported.

Palladium catalyzed selective distal C–H olefination of biaryl systems

In this report, we disclose the distal C–H olefination of biphenyl systems with high regio- and stereo-selectivity and useful synthetic yields.