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DP4+-Based Stereochemical Reassignment and Total Synthesis of Polyenic Macrolactam Muanlactam.
J Org Chem
January 2025
CINBIO, Departamento de Química Orgánica, Universidade de Vigo, Vigo 36310, Spain.
The total synthesis of the stereoisomer of muanlactam predicted by DP4+ calculations, which differed from that reported for the natural product on the relative configuration at C19, was completed, and the structure of the polyenic macrolactam was fully confirmed. Construction of the stereocenters involved the iterative enantio- and diastereoselective Krische's allylation reaction for the formal -1,3-diol and the addition of a propargylic Grignard reagent to Ellman's chiral nonracemic -butylsulfinamide for the enantiopure amine fragment. The conjugated triene and diene units were constructed by Suzuki-Miyaura cross-coupling reactions of the corresponding alkenylboronates and alkenyl iodides.
View Article and Find Full Text PDFBiomechanical evaluation of strength and stiffness of 2.0 mm and 1.5 mm locking plates with various screw configurations on rabbit tibias.
Res Vet Sci
January 2025
United States Military Academy, Department of Chemistry and Life Science, West Point, NY, United States of America.
Objective: The objective of this study was to compare the strength and stiffness of 1.5 mm and 2.0 mm locking plates with various screw fixation configurations applied to the tibia bones of rabbits.
View Article and Find Full Text PDFThe design of the illumination optics for high numerical aperture (NA) anamorphic extreme ultraviolet (EUV) projection optics is a critical challenge to EUV lithography in advanced technology node. However, the EUV illumination optics design using conventional methods have flaws in illumination efficiency and illumination uniformity due to the limitations of relay configuration and matching method that can only consider one factor affecting illumination uniformity. One-mirror configuration can improve illumination efficiency by reducing the number of mirrors.
View Article and Find Full Text PDFTowards Solid-State Batteries Using a Calcium Hydridoborate Electrolyte.
Angew Chem Int Ed Engl
January 2025
Aarhus University, iNANO, Department of Chemistry, Langelandsgade 140, 8000, Aarhus C, DENMARK.
Solid-state batteries created from abundant elements, such as calcium, may pave the way for cheaper and safer electrical energy storage. Here we report a new type of solid calcium hydridoborate electrolyte, Ca(BH4)2·2NH2CH3, with a high ionic conductivity of σ(Ca2+) ~ 10-5 S cm-1 at T = 70 °C, which is assigned to a relatively open and flexible structure with apolar moieties and weak dihydrogen bonds that facilitate migration of Ca2+ ions in the solid state. The compound display a low electronic conductivity, providing an ionic transport number close to unity (tion = 0.
View Article and Find Full Text PDFDihydroaurones and Isoflavan Derivatives from the Roots of .
J Nat Prod
January 2025
Department of Pharmacy, University of Salerno, Via Giovanni Paolo II 132, IT-84084 Fisciano, Salerno, Italy.
As a continuation of our pharmacognostic studies on different species growing in Türkiye, the phytochemical investigation of the roots of Hub.-Mor., a licorice species endemic to Türkiye, was carried out.
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