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Triggered by the reaction of an oxime ether with a rhodium carbenoid, nitrogen-containing three-dimensional frameworks were constructed from linear motifs via the intramolecular cycloaddition of -cyclic azomethine ylide. In this transformation, successive stereocenters containing quaternary carbons were formed, affording the corresponding tricyclic compounds in moderate-to-good yields. The utility of these products was demonstrated through several transformations.
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http://dx.doi.org/10.1021/acs.orglett.5c01153 | DOI Listing |
J Am Chem Soc
August 2025
Department of Chemistry, University of California, Berkeley, California 94720, United States.
In the past decade, thousands of synthetic building blocks, intermediates, and drug candidates containing a spirocyclopropane core with at least one nitrogen atom have been investigated for a range of biological activities. These compounds create three-dimensional architectures that maintain the rigidity of their more sp-rich analogs. Most examples contain simple core structures with unsubstituted cyclopropyl moieties, and only one has been made enantioselectively.
View Article and Find Full Text PDFOrg Lett
May 2025
Graduate School of Pharmaceutical Sciences, Nagoya University, Nagoya 464-8601, Japan.
Triggered by the reaction of an oxime ether with a rhodium carbenoid, nitrogen-containing three-dimensional frameworks were constructed from linear motifs via the intramolecular cycloaddition of -cyclic azomethine ylide. In this transformation, successive stereocenters containing quaternary carbons were formed, affording the corresponding tricyclic compounds in moderate-to-good yields. The utility of these products was demonstrated through several transformations.
View Article and Find Full Text PDFToxics
March 2025
National and Local & Joint Engineering Research Center for Urban Sewage Treatment and Resource Recycling, School of Environmental and Municipal Engineering, Qingdao University of Technology, 11 Fushun Road, Qingdao 266033, China.
Under the concept of green and low-carbon development, efficient and environmentally friendly biochar preparation methods have attracted much attention. This study assessed a novel sodium carbonate activator combined with acid modification for sludge-based biochar (SB) production and its adsorption of organics in wool scouring wastewater. Under 600 °C, the optimal carbonization temperature, the residual weight percentage of biochar carbonized material increases from 27% to 73% after NaCO activation compared to ZnCl activation.
View Article and Find Full Text PDFJ Chem Inf Model
April 2025
Division of Biophysical Chemistry, Department of Pharmaceutical Sciences, Graduate School of Pharmacy, Showa University, 1-5-8, Hatanodai, Shinagawa-ku, Tokyo, 142-8555, Japan.
Quantum mechanical (QM)-level molecular interaction fields (MIFs) are three-dimensional potential maps that describe the intermolecular interactions surrounding a target molecule, derived through QM calculations. This study employs QM-level MIFs (MIFs(QM)) and analyses of the Cambridge Structural Database (CSD) to uncover the three-dimensional characteristics of CH/π and CH/N interactions in typical nitrogen-containing heterocyclic compounds. Our findings confirm the reliability and applicability of MIF(QM) calculations for analyzing CH/π and CH/N interactions.
View Article and Find Full Text PDFChemSusChem
January 2025
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, 030001, PR China.
Pitch-based porous carbons with adjustable surface chemical property and controllable pore structure are regarded as promising cathode materials for aqueous zinc-ion hybrid capacitors (ZIHCs), while its disordered carbon matrix and microstructure as well as insufficient surface defects often result in low Zn-storage capacity and poor rate capability of ZIHCs. Herein, a synergetic strategy of self-assembled supermolecule and enriched defective carbon engineering was developed to achieve ultrahigh edge-nitrogen doping for ZIHCs. The crystallite defects and surface structure of porous carbon could be effectively achieved through grafting electronegative oxygen-containing small molecules and high-level nitrogen-containing functional groups between modified polycyclic aromatic hydrocarbon and supermolecule framework.
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