The ruthenium(II)-catalyzed C-H aminocarbonylation of N-(hetero)aryl-7-azaindoles with isocyanates is described. The excellent site selectivity at the ortho-position within the N-(hetero)aryl ring was observed to provide ortho-amidated N-(hetero)aryl-7-azaindoles under the mild reaction conditions. The resulting 7-azaindole derivatives can be readily transformed into 7-azaindoles containing carboxylic acid and alkyl amine functional groups.
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http://dx.doi.org/10.1021/acs.joc.8b00388 | DOI Listing |
Org Lett
December 2024
School of Chemical Sciences, Indian Institute of Technology Mandi, Mandi, Himachal Pradesh 175075, India.
Herein, we have developed a Cp*Co(III)-catalyzed cascade C-2 amidation/C-3 chlorination of indoles by leveraging the dual functionality of -chloroamides at ambient temperature. This protocol avoids the aminocarbonylation pathway that may result from the C-H functionalization of isocyanates formed via a potential Hofmann rearrangement of -chloroamides. In fact, this represents the first example of directed C-H amidation using -chloroamides as amidating agent.
View Article and Find Full Text PDFOrg Lett
November 2024
Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States.
The synthesis of sterically congested amides was accomplished via Cp*Co(III)-catalyzed sequential C-H bond addition to 1,3-dienes followed by aminocarbonylation with isocyanates, a coupling partner that had never been utilized in sequential C-H bond addition reactions. A variety of C-H bond reactants, internally substituted dienes, and aromatic isocyanates provided secondary amide products incorporating α-all-carbon quaternary centers. The conversion of the amide products to other useful compound classes was also demonstrated.
View Article and Find Full Text PDFAcc Chem Res
April 2024
State Key Laboratory of Coordination Chemistry, Chemistry and Biomedicine Innovation Center (ChemBIC), School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China.
ConspectusThe advent of the twenty-first century marked a golden era in the realm of synthetic chemistry, exemplified by groundbreaking advancements in the field of C-H activation, which is a concept that quickly transitioned from mere academic fascination to an essential element within the synthetic chemist's toolkit. This methodological breakthrough has given rise to a wealth of opportunities spanning a wide range of chemical disciplines. It has facilitated the late-stage diversification of elaborate organic frameworks, encompassing the spectrum from simple methane to complex polymers, thus refining the lead optimization process and easing the production of diverse molecular analogues.
View Article and Find Full Text PDFMolecules
September 2023
Laboratory of Industrial and Synthetic Organic Chemistry (LISOC), Department of Chemistry and Chemical Technologies, University of Calabria, Via Pietro Bucci 12/C, 87036 Arcavacata di Rende, Italy.
2-Propargyl-1,3-dicarbonyl compounds have been carbonylated under oxidative conditions and with the catalysis of the PdI/KI catalytic system to selectively afford previously unreported 2-(4-acylfuran-2-yl)acetamides in fair to good yields (54-81%) over 19 examples. The process takes place under relatively mild conditions and occurs via a mechanistic pathway involving C-H activation by oxidative monoamincarbonylation of the terminal triple bond of the substrates with formation of 2-ynamide intermediates, followed by 5---cyclization (via intramolecular conjugate addition of the in situ formed enolate to the 2-ynamide moiety) and aromative isomerization.
View Article and Find Full Text PDFChemistry
November 2023
Medicinal Chemistry, Research and Early Development, Cardiovascular, Renal and Metabolism (CVRM), Biopharmaceuticals R&D, AstraZeneca, Gothenburg, Pepparedsleden1, 431 50, Mölndal, Sweden.
Introducing amide functional groups under mild conditions has growing importance owing to the prevalence of such moiety in biologically active molecules. Herein, we disclose a mild protocol for the directed ruthenium-catalyzed C-H aminocarbonylation with isocyanates as the amidating agents developed through high-throughput experimentation (HTE). The redox-neutral and base-free reaction is guided by weakly Lewis basic functional groups, including anilides, lactams and carbamates to access anthranilamide derivatives.
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