Azetidine is a prevalent structural motif found in various biologically active compounds. In this research paper, we report La(OTf)-catalyzed intramolecular regioselective aminolysis of -3,4-epoxy amines to afford azetidines. This reaction proceeded in high yields even in the presence of acid-sensitive and Lewis basic functional groups.
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http://dx.doi.org/10.3389/fchem.2023.1251299 | DOI Listing |
Phys Chem Chem Phys
January 2025
Institute of Chemistry, Department of Fundamental Chemistry, University of São Paulo, Av. Prof. Lineu Prestes, 748 - Butantã, São Paulo, 05508-900, Brazil.
The conformational isomerization of nitrous acid (HONO) promoted by excitation of the or stretching normal coordinates is the first observed case of an infrared-induced photochemical reaction. The energy captured by the excited normal modes is redistributed into a highly excited vibrational level of the torsion normal coordinate, which is the isomerization reaction coordinate. Herein, we present simple numerical methods to qualitatively investigate the coupling between the normal coordinates and the possible gateways for vibrational energy redistribution leading to the isomerization process.
View Article and Find Full Text PDFChem Sci
January 2025
School of Biomedical Engineering, Shanghai Jiao Tong University Shanghai 200240 China
Intracellular viscosity is a critical microenvironmental factor in various biological systems, and its abnormal increase is closely linked to the progression of many diseases. Therefore, precisely controlling the release of bioactive molecules in high-viscosity regions is vital for understanding disease mechanisms and advancing their diagnosis and treatment. However, viscosity alone cannot directly trigger chemical reactions.
View Article and Find Full Text PDFACS Chem Neurosci
January 2025
School of Health & Life Sciences, Teesside University, Middlesbrough TS1 3BX, United Kingdom.
The aggregation of α-synuclein is crucial to the development of Lewy body diseases, including Parkinson's disease and dementia with Lewy bodies. The aggregation pathway of α-synuclein typically involves a defined sequence of nucleation, elongation, and secondary nucleation, exhibiting prion-like spreading. This study employed Raman spectroscopy and machine learning analysis, alongside complementary techniques, to characterize the biomolecular changes during the fibrillation of purified recombinant wild-type α-synuclein protein.
View Article and Find Full Text PDFTalanta
January 2025
Institute of Environmental Science and School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan, 030006, China. Electronic address:
Lipid droplets (LDs) are essential organelles used to store lipids and participate in cellular lipid metabolism. Imaging LDs is an intuitive approach to comprehend their biological functions. Herein, the LDs-targeted CDs (LD-CDs) featuring robust solvatochromic emission were elaborately designed by a Schiff base reaction using 1, 2-diamino-4-fluorobenzene, 3-dimethylaminophenol, and thiourea as precursors.
View Article and Find Full Text PDFInorg Chem
January 2025
Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada.
The lanthanide contraction is a widely known phenomenon in which the ionic radii of the Ln ions decrease across the series from La to Lu. As a result, the distance (Ln-Y), where Y is a ligand donor atom, decreases across the series. As shown previously, the decrease normally has a linear dependence on the number of 4f Ln electrons, , and the net change, Δ', is between 0.
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