The Lewis acid(LA)-catalyzed Diels-Alder reaction between isoprene and methyl acrylate was investigated quantum chemically using a combined density functional theory and coupled-cluster theory approach. Computed activation energies systematically decrease as the strength of the LA increases along the series I
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7187354 PMC http://dx.doi.org/10.1002/anie.201914582 DOI Listing Publication Analysis
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Anaerobe
January 2025
Department of Anatomy and Cell Biology, University of Florida College of Medicine, Gainesville, FL 32610.
The probing of live bacteria via the incorporation of fluorescent D-amino acids (FDAAs) during peptidoglycan synthesis has been shown to be practical for visualizing both gram-positive and gram-negative bacterial species. This study demonstrates the reliability and applications of FDAA labelling for the fluorescent imaging of an obligate anaerobe.
View Article and Find Full Text PDFJ Am Chem Soc
January 2025
School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
Defluorination reactions are increasingly vital due to the extensive use of organofluorine compounds with robust carbon-fluorine (C-F) bonds; particularly, the efficient defluorination of widespread and persistent per- and polyfluoroalkyl substances under mild conditions is crucial due to their accumulation in the environment and human body. Herein, we demonstrate that surface-modified silicate of pronounced proton affinity can confine active hydrogen (•H) onto nanoscale zerovalent iron (nZVI) by withdrawing electrons from nZVI to react with bound protons, generating confined active hydrogen (•H) for efficient defluorination under ambient conditions. The exposed silicon cation (Si) of silicate functions as a Lewis acid site to activate the C-F bond by forming Si.
View Article and Find Full Text PDFJ Am Chem Soc
January 2025
Institute of Organic Chemistry, University of Leipzig, 04103 Leipzig, Germany.
The enantioselective synthesis of 1,4-dicarbonyl compounds continues to pose a significant challenge in organic synthesis, and a catalytic process which generates two adjacent stereogenic centers with full stereochemical control is lacking until now. The 1,4-relationship of the functional groups requires an Umpolung strategy as one of the α-carbonyl positions has to be inverted into an electrophilic center to react with a normal enolate. We report herein the highly enantio- and diastereoselective addition of silyl ketene acetals toward electrophilic 1-azaallyl cations to furnish chiral 4-hydrazonoesters, which are masked 1,4-dicarbonyl compounds.
View Article and Find Full Text PDFExtracell Vesicles Circ Nucl Acids
November 2024
State Key Laboratory of Systems Medicine for Cancer, Renji Hospital, School of Medicine and School of Biomedical Engineering, Shanghai Jiao Tong University, Shanghai 200030, China.
The article explores celery-derived extracellular vesicles (CDEVs), characterized by high cellular uptake, low immunogenicity, and high stability, as a therapeutic strategy for antitumor nanomedicines. The methods employed in this study include cell experiments such as co-culture, Western Blot, and flow cytometry. experiments were conducted in C57BL/6 tumor-bearing mice subcutaneously injected with Lewis lung carcinoma (LLC) cells.
View Article and Find Full Text PDFNat Commun
January 2025
Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University, Beijing, 100871, China.
Direct conversion of dinitrogen (N) into N-containing compounds beyond ammonia under ambient conditions remains a longstanding challenge. Herein, we present a Lewis acid-promoted strategy for diverse nitrogen-element bonds formation from N using chromium dinitrogen complex [Cp*(IPrMe)Cr(N)]K (1). With the help of Lewis acids AlMe and BF, we successfully trap a series of fleeting diazenido intermediates and synthesize value-added compounds containing N-B, N-Ge, and N-P bonds with 3 d metals, offering a method for isolating unstable intermediates.
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