Two-coordinate silylamido complexes of nickel and copper rapidly react with CO to selectively form a new cyanate ligand along with hexamethyldisiloxane byproducts. Mechanistic insight into these reactions was obtained from the synthesis of proposed intermediates, several silyl- and phenyl- substituted amido analogues, and their subsequent reactivity with CO. These studies suggest that a unique intramolecular double silyl transfer step facilitates CO deoxygenation, which likely contributes to the rapid rates of reaction. The deoxygenation reactions create a platform for a synthetic cycle in which copper amido complexes convert CO to organic silylcarbamates.
Download full-text PDF |
Source |
---|---|
http://dx.doi.org/10.1021/acs.inorgchem.2c03453 | DOI Listing |
J Org Chem
January 2025
Faculty of Science, Kunming University of Science and Technology, Jingming South Road 727, Chenggong District, Kunming 650500, P. R. China.
A novel silver-catalyzed cascade radical isonitrile insertion and defluorinative cyclization have been developed to synthesize CFH- and phosphinoyl-containing quinolines from -isocyanyl α-trifluoromethylstyrenes. The reaction proceeded under redox-neutral conditions and allowed the construction of a highly attractive quinoline ring system, with the simultaneous formation of the CFH group and introduction of various phosphinoyl groups in a single transformation, showing operational simplicity, a wide substrate scope, good tolerance for functional groups, and remarkable atom-/stepeconomy. Mechanistic studies indicated that the reaction is likely to involve the participation of P-centered radicals and key carbanion intermediates.
View Article and Find Full Text PDFJ Am Chem Soc
January 2025
Merck Center for Catalysis at Princeton University, Princeton, New Jersey 08544, United States.
The direct synthesis of C(sp)-rich architectures is a driving force for innovation in synthetic organic chemistry. Such scaffolds impart beneficial properties onto drug molecules that correlate with greater clinical success. Consequently, there is a strong impetus to develop new methods by which to access sp-rich molecules from commercial feedstocks, such as alkenes.
View Article and Find Full Text PDFJ Am Chem Soc
January 2025
Department of Chemistry, University of California, Berkeley, California 94720, United States.
Dioxygen (O) is a potent oxidant used by aerobic organisms for energy transduction and critical biosynthetic processes. Numerous metalloenzymes harness O to mediate C-H bond hydroxylation reactions, but most commonly feature iron or copper ions in their active site cofactors. In contrast, many manganese-activated enzymes─such as glutamine synthetase and isocitrate lyase─perform redox neutral chemical transformations and very few are known to activate O or C-H bonds.
View Article and Find Full Text PDFJ Org Chem
December 2024
Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, 1 Sub-lane Xiangshan, Hangzhou 310024, P.R. China.
A novel method is reported to synthesize various pyrazolones through transition-metal-free and redox-neutral 1°, 2°, or 3° C(sp)-H carbonylative cyclization using 1 atm of CO as a green carbonyl source, featuring good functional group tolerance, a broad substrate scope, facile scalability, and easy product transformation. The utility of this method could be demonstrated by the applications in preparing useful synthetic intermediates and bioactive compounds.
View Article and Find Full Text PDFJACS Au
November 2024
School of Chemistry, Sun Yat-sen University, Guangzhou 510006, P.R. China.
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!