Cobalt-catalyzed C-H allylation reactions of NH-free benzimidates using vinylcyclopropanes or allyl carbonate are reported. The reactive and relatively unstable imidate groups remain intact during the C-H allylations to afford functionalized imidates without dealcoholizations. The thus obtained allylated imidate was subsequently converted into other heterocyclic structures through a following C-H functionalization reaction, demonstrating the synthetic utility of this method.

Download full-text PDF

Source
http://dx.doi.org/10.1021/acs.joc.9b01972DOI Listing

Publication Analysis

Top Keywords

cobalt-catalyzed c-h
8
c-h allylation
8
imidate intact
4
intact directing
4
directing group
4
group cobalt-catalyzed
4
c-h
4
allylation cobalt-catalyzed
4
allylation reactions
4
reactions nh-free
4

Similar Publications

Monoanionic, bidentate-auxiliary-directed, cobalt-catalyzed C-H bond functionalization has become a very useful tool in organic synthesis. A comprehensive investigation into isolated organometallic intermediates and their reactivity within the catalytic cycle is lacking. We report here mechanistic studies of cobalt-catalyzed, aminoquinoline-directed C(sp)-H bond functionalization.

View Article and Find Full Text PDF

Cobalt(II)-Catalyzed Selective C2-H Heck Reaction of Native (N-H) Indoles Enabled by Salicylaldehyde Ligand.

J Org Chem

January 2025

Collaborative Innovation Center for Advanced Organic Chemical Materials Co-Constructed by the Province and Ministry, Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, Hubei Key Laboratory for Precision Synthesis of Small Molecule Pharmaceuticals, College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, P. R. China.

Direct functionalization of native (N-H) indoles via C-H activation remains a challenge. Herein, we report a salicylaldehyde-promoted cobalt-catalyzed selective C2-H Heck reaction of native (N-H) indoles with both active and unactivated olefins in the presence of free N-H bonds. A series of structurally diverse C2-alkenylated native (N-H) indoles including natural product and drug derivatives were prepared directly and effectively without additional preprotection and deprotection procedures.

View Article and Find Full Text PDF

A simple cobalt-catalyzed, picolinamide-directed C8-H sulfoxamination of 1-naphthalamides with NH-sulfoximines has been developed. This cross-dehydrogenative C-H/N-H coupling reaction offers a facile route to N-arylated sulfoximines, exhibiting high yields, a broad substrate scope, and excellent functional group tolerance and scalability.

View Article and Find Full Text PDF

Herein, we report a simple method for the synthesis of 3-benzazepine derivatives via a cobalt-catalyzed, picolinamide-directed α-amidoacrylate C(sp)-H bond functionalization approach. The reactions utilize calcium carbide as an inexpensive, easy-to-handle, and solid acetylene source, and simple CoCl as the reaction catalyst. Excellent functional group tolerance is observed, yielding diverse substituted 3-benzazepine derivatives in good to excellent yields.

View Article and Find Full Text PDF

N-Directed, Radical Relay Enantioconvergent Sulfinylation of Distal C(sp)-H Bonds via Cobalt Catalysis.

Org Lett

October 2024

Jiangsu Key Laboratory of Neuropsychiatric Diseases and Department of Medicinal Chemistry, College of Pharmaceutical Sciences, Soochow University, 199 Ren-Ai Road, Suzhou, Jiangsu 215123, China.

Cobalt-catalyzed enantioconvergent cross-coupling of C(sp)-H bonds with -generated sulfenate anions is achieved to access chiral sulfoxides, which are found in the structures of many biologically active agents. The more challenging aliphatic C-H bonds as well as sterically hindered substrates containing tertiary C-H bonds could also be tolerated well. Mechanistic studies indicate that the transformation could undergo a CoS(O)R-mediated single-electron transfer with -fluorocarboxamides, followed by a 1,5-hydrogen atom transfer and then a pivotal organocobalt(IV)-controlled enantioselective cross-coupling process.

View Article and Find Full Text PDF

Want AI Summaries of new PubMed Abstracts delivered to your In-box?

Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!