Transition-metal-free oxidative carboazidation of acrylamides via cascade C–N and C–C bond-forming reactions

A novel transition-metal-free oxidative carboazidation of acrylamides using inexpensive NaN₃ and K₂S₂O₈ was achieved, which not only provided an efficient method to prepare various N₃-substituted oxindoles, but also represented a novel strategy for C–N and C–C bond formation via a free-radical cascade process.

Copper-catalyzed intermolecular azidocyanation of aryl alkenes

A copper-catalyzed Markovnikov-type intermolecular azidocyanation of aryl alkenes has been developed for the first time.

Iron-catalyzed radical aryldifluoromethylation of activated alkenes to difluoromethylated oxindoles

An iron-catalyzed aryldifluoromethylation of activated alkenes has been developed, which is a rare example where a cosolvent is used to improve the yield along with Fenton's reagent.

Copper-catalyzed oxidative cascade coupling of N-alkyl-N-phenylacrylamides with aryl aldehydes

An oxidative cascade coupling reaction between N-alkyl-N-phenylacrylamides and aryl aldehydes using CuCl₂/TBHP (tert-butyl hydroperoxide) as a catalyst and oxidant was developed.

1,2-Alkylarylation of activated alkenes with dual C–H bonds of arenes and alkyl halides toward polyhalo-substituted oxindoles

Alkylarylation of N-arylacrylamides with alkyl halides through selective scission of the C(sp³)–H bond adjacent to halide atoms is presented.

Copper-catalyzed cyanoalkylarylation of activated alkenes with AIBN: a convenient and efficient approach to cyano-containing oxindoles

A novel, simple, and cost-effective protocol has been developed for the construction of cyano-containing oxindoles by copper-catalyzed direct cyanoalkylarylation of activated alkenes with AIBN.

Copper-catalyzed bis-arylations of alkenes leading to oxindole derivatives

A simple and practical copper-catalyzed approach to oxindole derivatives by copper-catalyzed bis-arylation of N-alkyl-N-phenylacrylamides with diaryliodonium triflates has been developed under mild conditions, and the method is of tolerance towards some functional groups in the substrates.

Metal-free radical cascade dichloromethylation of activated alkenes using CH2Cl2: highly selective activation of the C–H bond

A dicumyl peroxide-initiated highly selective activation of the (sp³)C–H bond in dichloromethane (DCM, CH₂Cl₂) has been achieved, which allows efficient access to dichloronated oxindoles via a free-radical cascade process.

The cross-dehydrogenative coupling of C(sp3)-H bonds: a versatile strategy for C-C bond formations

Over the last decade, substantial research has led to the introduction of an impressive number of efficient procedures which allow the selective construction of CC bonds by directly connecting two different CH bonds under oxidative conditions. Common to these methodologies is the generation of the reactive intermediates in situ by activation of both CH bonds. This strategy was introduced by the group of Li as cross-dehydrogenative coupling (CDC) and discloses waste-minimized synthetic alternatives to classic coupling procedures which rely on the use of prefunctionalized starting materials. This Review highlights the recent progress in the field of cross-dehydrogenative C sp 3C formations and provides a comprehensive overview on existing procedures and employed methodologies.

Silver-catalyzed oxidative coupling/cyclization of acrylamides with 1,3-dicarbonyl compounds

An efficient silver-catalyzed oxidative cyclization of acrylamides with 1,3-dicarbonyl compounds is described. It proceeds through a tandem radical addition/cyclization process, in which two new C–C bonds were formed.