Although multivalent glycosidase inhibitors have shown enhanced glycosidase inhibition activities, further applications and research directions need to be developed in the future. In this paper, two positional isomeric perylene bisimide derivatives ( and ) with 1-deoxynojirimycin conjugated were synthesized. Furthermore, and showed positional isomeric effects on the optical properties, self-assembly behaviors, glycosidase inhibition activities, and hypoglycemic effects. Importantly, exhibited potent hypoglycemic effects in mice with 41.33 ± 2.84 and 37.45 ± 3.94% decreases in blood glucose at 15 and 30 min, respectively. The molecular docking results showed that the active fragment of has the highest binding energy (9.649 kcal/mol) and the highest total hydrogen bond energy (62.83 kJ/mol), which were related to the positional isomeric effect on the hypoglycemic effect in mice. This work introduced a new means to develop antihyperglycemic agents in the field of multivalent glycomimetics.
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http://dx.doi.org/10.1021/acs.jmedchem.1c00036 | DOI Listing |
Angew Chem Int Ed Engl
December 2024
Nankai University, Colege of Chemistry, CHINA.
Organic photovoltaic materials that can be processed via non-halogenated solvents are crucial for the large-area manufacturing of organic solar cells (OSCs). However, the limited available of electron acceptors with adequate solubility and favorable molecular packing presents a challenge in achieving efficient non-halogenated solvent-processed OSCs. Herein, inspired by the three-dimensional dimeric acceptor CH8-4, we employed a molecular isomerization strategy to synthesize its isomers, CH8-4A and CH8-4B, by tuning the position of fluorine (F) atom in the central unit.
View Article and Find Full Text PDFInorg Chem
December 2024
School of Chemical Science and Engineering, Tongji University, Shanghai 200092, P. R. China.
The vapor-phase alkylation of phenol with methanol was investigated on X zeolites and modified X zeolites. First, the difference of product distribution was tested between acid zeolite (HZSM-5, HX, HMCM-22, and Hβ) and basic zeolite X (KX and CsX). Then, X zeolites were modified with Li, K, Cs, Ca, Mg, La, and Ce ion exchange to adjust the acid-base properties of the zeolites.
View Article and Find Full Text PDFOrg Biomol Chem
December 2024
Department of Chemistry, Bogazici University, Bebek, Istanbul 34342, Turkey.
Aldol reactions are one of the most fundamental organic reactions involving the formation of carbon-carbon bonds that are commonly used in the synthesis of complex molecules through the condensation of an enol or enolate with a carbonyl group. The aldol reaction of thiohydantoin derivatives with benzaldehyde starts with hydrogen removal from C5 by lithium diisopropylamide (LDA) to form the enolate. Benzaldehyde adds to the enolate either at the less or more hindered site.
View Article and Find Full Text PDFCommun Chem
December 2024
Laboratory of Structural Chemistry and Biology, Institute of Chemistry, ELTE Eötvös Loránd University, Pázmány Péter sétány 1/A, 1117, Budapest, Hungary.
Under physiological conditions in peptides or proteins, the -AsnGly- motif autonomously rearranges within hours/days to β-Asp and α-Asp containing sequence, via succinimide intermedier. The formation of the succinimide is the rate-limiting step, with a strong pH and temperature dependence. We found that Arg(+) at the (n + 2) position (relative to Asn in the n position) favors isomerisation by forming a transition-state like structure, whereas Glu(-) disfavors isomerisation by adopting a β-turn like conformer.
View Article and Find Full Text PDFJ Am Chem Soc
December 2024
Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China.
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