Cobalt-promoted dimerization of aminoquinoline benzamides

Cobalt-catalyzed chelation assisted C–H allylation of aromatic amides with unactivated olefins

The reaction of aromatic amides with unactivated olefins in the presence of Co(OAc)₂ gave allylated products, not vinylated products.

Divergent copper-mediated dimerization and hydroxylation of benzamides involving C–H bond functionalization

Copper-mediated C–H activation of aminoquinoline benzamides to give either hydroxylation or dimerization compounds were investigated.

Highly mono-selective ortho-trifluoromethylation of benzamides via 8-aminoquinoline assisted Cu-promoted C–H activations

A highly mono-selective ortho-trifluoromethylation of benzamides was achieved via Cu-promoted C–H activations employing an 8-aminoquinoline group as the bidentate directing group and Togni reagent II as the CF₃ source.

Cu-catalyzed one-pot synthesis of fused oxazepinone derivatives via sp2 C–H and O–H cross-dehydrogenative coupling

An efficient Cu-catalyzed cascade reaction protocol was developed for the synthesis of fused oxazepinone derivatives via sp² C–H and O–H cross-dehydrogenative coupling.

Room-temperature cobalt-catalyzed arylation of aromatic acids: overriding the ortho-selectivity via the oxidative assembly of carboxylate and aryl titanate reagents using oxygen

A room temperature phosphine or NHC ligand-free cobalt-catalyzed arylation of (hetero)aromatic acids has been developed.

Cobalt(iii)-catalyzed synthesis of pyrroles from enamides and alkynes

An efficient and regioselective cobalt-catalyzed synthesis of multi-substituted pyrroles is reported by the use of readily available enamides and alkynes.

Cobalt-promoted selective arylation of benzamides and acrylamides with arylboronic acids

A novel cobalt-promoted arylation of aryl C–H bonds with arylboronic acids has been realized by using 8-aminoquinoline as the directing group. A notable feature of this newly developed protocol is that acrylamides, which cannot be arylated using copper salts as the promoter, can also be efficiently arylated.

Cobalt(iii)-catalyzed efficient synthesis of indenones through carboannulation of benzoates and alkynes

Cobalt(iii)-catalyzed C–H activation of simple benzoate esters has been achieved, and redox-neutral annulative coupling with internal alkynes allowed efficient synthesis of indenones.

Unified Protocol for Cobalt-Catalyzed Oxidative Assembly of Two Aryl Metal Reagents Using Oxygen as an Oxidant

The first cobalt-catalyzed oxidative cross-coupling reaction of two aryl metal reagents is described. An equivalent amount of two aryl Grignard or lithium reagents, after mediation by an equivalent amount of simple ClTi(OEt)3, was facilely assembled under the catalysis of 1 mol % of CoCl2/10 mol % of DMPU using oxygen. The cross-couplings between various aryl metal reagents, especially between two structurally similar aryl Grignard reagents, proceeded smoothly and selectively and, thus, provided a highly general and efficient method for the construction of biaryl compounds.

Weak Coordination Promoted Regioselective Oxidative Coupling Reaction for 2,2'-Difunctional Biaryl Synthesis in Hexafluoro-2-propanol

An unprecedented weak coordination promoted dehydrogenative cross-coupling reaction has been developed by palladium catalysis, which provides a convenient access to a wide range of 2,2'-difunctional biaryls from easily accessible substrates. Both HFIP solvent and oxidants serve as the critical factors in this new reaction. A plausible mechanism involving Pd(II)/Pd(IV) is proposed. The reaction demonstrates excellent reactivity, broad functional-group tolerance and high yields.

Cobalt(III)-Catalyzed C-H Bond Amidation with Isocyanates

The first examples of cobalt(III)-catalyzed C-H bond addition to isocyanates are described, providing a convergent strategy for arene and heteroarene amidation. Using a robust air- and moisture-stable catalyst, this transformation demonstrates a broad isocyanate scope and good functional-group compatibility and has been performed on gram scale.

Step economical synthesis of o-aryl benzamides via C–H activation relayed by the in situ installation of directing group: a multicomponent method

Multicomponent reactions have been successfully applied as a platform for the step economical C–H activation based synthesis wherein the in situ installation of directing group and the subsequent C–H arylation have been achieved in one-step.