The α-3-(1,2,4-triazine)-α-cyanoacetate derivatives exhibit a unique and well-defined dearomatized structure undergoing efficient organocatalytic aromatization-alkylation sequences with Michael acceptors in order to construct an all-carbon tetrasubstituted stereocenter with high ee values. These new players in the field of enantioselective catalytic benzylic C-H functionalization afford versatile molecular platforms toward the construction of valuable 3D-heterocycles.
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http://dx.doi.org/10.1021/acs.orglett.5c00008 | DOI Listing |
JACS Au
February 2025
Research Center for Chemical Biology and Omics Analysis, Department of Chemistry, Southern University of Science and Technology, 1088 Xueyuan Blvd., Shenzhen, Guangdong 518055, P.R. China.
The Mislow-Braverman-Evans rearrangement, the reversible [2,3]-sigmatropic rearrangement of allylic sulfoxides to allylic sulfenate esters, finds widespread applications in organic synthesis and medicinal chemistry. However, the products of this powerful strategy have primarily been limited to derivatives of allylic alcohols. In contrast, access to structurally similar benzylic alcohols has not yet been established.
View Article and Find Full Text PDFJ Am Chem Soc
March 2025
Department of Chemistry, University of Wisconsin-Madison, Madison, Wisconsin 53706, United States.
Polystyrene (PS) is a widely used thermoplastic polymer, but its very low recycling rate has motivated consideration of chemical conversion strategies to convert waste PS into value-added products. Oxidation methods have been widely studied, but they typically generate benzoic acid, a product with a relatively low market demand. Phenol is a higher volume chemical that would be an appealing target, but no methods currently exist for the conversion of PS into phenol.
View Article and Find Full Text PDFNat Commun
February 2025
Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian, China.
Marvelous natures of alkali and alkaline earth metal hydrides in catalyzing chemical transformations are being discovered. However, the synthesis of (sub)nanostructured metal hydrides, critically important to enhance their catalytic performances, is yet a very challenging task. Herein, we develop a highly reactive heterogeneous catalyst comprising atomically dispersed barium hydrides on MgO support with an ultrahigh barium loading of up to 20 wt% via a convenient preparation method involving liquid-ammonia impregnation followed by hydrogenation.
View Article and Find Full Text PDFChem Commun (Camb)
March 2025
Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, India.
Pd-catalyzed carboxylate-directed C-H alkenylation and alkylation of benzoic acids has been achieved by switching the MBH alcohol used as the coupling partner. The alkenylation results in the formation of aryl acrylaldehydes, whereas the alkylation furnishes the formation of α-benzyl β-ketoesters.
View Article and Find Full Text PDFChem Soc Rev
March 2025
Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang Province 310058, China.
Benzylic C-H functionalization is a valuable tool to make complex aromatic molecules from simple, readily available alkylbenzenes. While methods that involve benzylic radicals or cations generated by hydrogen atom transfer or oxidation have been well demonstrated, they often require oxidative conditions. In contrast, deprotonation methods offer a complementary approach to transform benzylic C-H bonds through a benzylic carbanion generated by deprotonation.
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