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A short and efficient synthesis, based on a one-step double elimination, of a key intermediate in the synthesis of various glucocorticosteroids has been developed. This method can be carried out on large scale for further industrial applications. The synthesis allowed us to identify a novel prednisolone derivative 10 and its anti-inflammatory activity was determined in an in vivo model of inflammation. In order to understand the regioselectivity of the double elimination under various conditions, mechanistic studies were undertaken and confirmed the experimental results. We also propose a mechanism for the formation of the new steroid 10 studied by molecular modeling.
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http://dx.doi.org/10.1016/j.steroids.2018.06.007 | DOI Listing |
ACS Nano
September 2025
Eastern Institute for Advanced Study, Eastern Institute of Technology, Ningbo, Zhejiang 315200, P. R. China.
Ni-Fe (oxy)hydroxides are among the most active oxygen evolution reaction (OER) catalysts in alkaline media. However, achieving precise control over local asymmetric Fe-O-Ni active sites in Ni-Fe oxyhydroxides for key oxygenated intermediates' adsorption steric configuration regulation of the OER is still challenging. Herein, we report a two-step dealloying strategy to fabricate asymmetric Fe-O-Ni pair sites in the shell of NiOOH@FeOOH/NiOOH heterostructures from NiFe Prussian blue analogue (PBA) nanocubes, involving anion exchange and structure reconstruction.
View Article and Find Full Text PDFMol Divers
September 2025
Department of Chemistry, College of Science, King Khalid University, P.O. Box 9004, 61413, Abha, Saudi Arabia.
The catalytic asymmetric Mannich reaction is a multicomponent reaction which affords β-amino carbonyl compounds by utilizing an aldehyde, a primary or secondary amine/ammonia, and a ketone. β-amino carbonyl scaffolds are crucial intermediates for the synthesis of naturally occurring bioactive compounds and their derivatives. The synthesized natural compounds exhibit a broad spectrum of biological activities including anti-fungal, anti-cancer, anti-bacterial, anti-HIV, anti-oxidant, and anti-inflammatory activities.
View Article and Find Full Text PDFEnviron Sci Technol
September 2025
Key Laboratory of Green Utilization of Critical Non-metallic Mineral Resources, Ministry of Education, Wuhan University of Technology, Wuhan 430070, China.
Rapidly expanding nascent ecosystems at glacier forefields under climate warming dramatically enhance the terrestrial carbon (C) sink. Microbial C fixation and degradation, closely implicated in nitrogen (N) transformation and plant-soil-microbe interactions, significantly regulate soil C accumulation. However, how shifts in microbial functional potential impact soil C sequestration during vegetation succession remains unclear.
View Article and Find Full Text PDFOrg Lett
September 2025
National Key Laboratory of Advanced Drug Delivery and Release Systems, School of Pharmaceutical Sciences & Institute of Materia Medica, Shandong First Medical University & Shandong Academy of Medical Sciences, Jinan 250117, P. R. China.
A method for the conversion of isoxazoles into thiazoles by skeleton rearrangement has been achieved by an ammonium iodide-catalyzed cycloaddition protocol under mild conditions with a broad substrate scope and good functional group tolerance. Most appealingly, the reaction can proceed smoothly without the addition of any transition metal catalyst. Detailed mechanistic studies, including control experiments and key reaction intermediate characterization, reveal an intermolecular [3+2] cycloaddition reaction pathway.
View Article and Find Full Text PDFJ Am Chem Soc
September 2025
Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) State Key Laboratory of Advanced Chemical Power Sources, College of Chemistry, Nankai University, Tianjin 300071, China.
Developing cost-effective spinel oxide catalysts with both high oxygen evolution reaction (OER) activity and stability is crucial for advancing sustainable clean energy conversion. However, practical applications are often hindered by the activity limitations inherent in the adsorbate evolution mechanism (AEM) and the stability limitations associated with the lattice oxygen mechanism (LOM). Herein, we demonstrate structural changes induced by phase transformation in CoMn spinel oxides, which yield more active octahedral sites with shortened intersite distance.
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