The pharmaceutical chemical industry has long used kinetic resolution to obtain high-value compounds. Organocatalysis has recently been added to this strategy, allowing for the resolution of racemic mixtures with low catalyst loadings and mild reaction conditions. This research focuses on the kinetic resolution of 1,5-dicarbonyl compounds using a retro-Michael reaction, co-catalyzed at room temperature with 20 mol % of the Jørgensen-Hayashi catalyst and PNBA. The study highlights the importance of conducting the kinetic resolution at a concentration of approximately ten millimolar (mM) to prevent the Michael retro-Michael equilibrium from affecting the process.
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http://dx.doi.org/10.3762/bjoc.21.34 | DOI Listing |
Beilstein J Org Chem
March 2025
Instituto Universitario CINQUIMA y Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Valladolid, Paseo Belén 7, 47011-Valladolid, Spain.
The pharmaceutical chemical industry has long used kinetic resolution to obtain high-value compounds. Organocatalysis has recently been added to this strategy, allowing for the resolution of racemic mixtures with low catalyst loadings and mild reaction conditions. This research focuses on the kinetic resolution of 1,5-dicarbonyl compounds using a retro-Michael reaction, co-catalyzed at room temperature with 20 mol % of the Jørgensen-Hayashi catalyst and PNBA.
View Article and Find Full Text PDFChem Sci
February 2025
European XFEL 22869 Schenefeld Germany
New coordination complexes of 3d metals that possess photoactive metal-centered (MC) excited states are promising targets for optical applications and photocatalysis. Ultrafast spectroscopy plays an important role in elucidating the photophysical mechanisms that underlie photochemical activity. However, it can be difficult to assign transient signals to specific electronic excited states and mechanistic information is often inferred from kinetics.
View Article and Find Full Text PDFAngew Chem Int Ed Engl
March 2025
Guizhou University, National Key Laboratory of Green Pesticide, 2708 South Huaxi Road, 550025, Guiyang, CHINA.
Catalyst-controlled approaches for the synthesis of S-stereogenic compounds have propelled significant advancements in asymmetric synthetic chemistry. In contrast, control over S-heteroatom (e.g.
View Article and Find Full Text PDFJ Lipid Res
March 2025
LIMES Life and Medical Sciences Institute, University of Bonn, Bonn, Germany. Electronic address:
Mammalian cells synthesize hundreds of different variants of their prominent membrane lipid phosphatidylcholine (PC), all differing in the side chain composition. This batch is constantly remodeled by the Lands cycle, a metabolic pathway replacing one chain at the time. Using the alkyne lipid lyso-phosphatidylpropargylcholine (LpPC), a precursor and intermediate in PC synthesis and remodeling, we study both processes in brain endothelial bEND3 cells.
View Article and Find Full Text PDFBiophys Rep
February 2025
Institute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, Chengdu 611731, China.
Some microbes are referred to as model organisms because they are easy to study in the laboratory and hold the ability to retain their characteristics during DNA replication, DNA transcription, and other fundamental processes. Studying these microbes in living cells via single-molecule imaging allows us to better understand these processes at highly improved spatiotemporal resolution. Single particle tracking photoactivated localization microscopy (sptPALM) is a robust tool for detecting the positions and motions of individual molecules with tens of nanometers of spatial and millisecond temporal resolution , providing insights into intricate intracellular environments that traditional ensemble methods cannot.
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