Results 11 to 20 of about 5,442 (212)

A New Diketopiperazine, Cyclo-(4-S-hydroxy-R-proline-R-isoleucine), from an Australian Specimen of the Sponge Stelletta sp. [PDF]

open access: yesMarine Drugs, 2011
While investigating the cytotoxic activity of the methanol extract of an Australian marine sponge Stelletta sp. (Demospongiae), a new diketopiperazine, cyclo-(4-S-hydroxy-R-proline-R-isoleucine) (1), was isolated together with the known bengamides; A (2),
Dianne M. Tapiolas   +6 more
doaj   +2 more sources

Double the Chemistry, Double the Fun: Structural Diversity and Biological Activity of Marine-Derived Diketopiperazine Dimers

open access: yesMarine Drugs, 2019
While several marine natural products bearing the 2,5-diketopiperazine ring have been reported to date, the unique chemistry of dimeric frameworks appears to remain neglected.
Nelson G. M. Gomes   +3 more
doaj   +2 more sources

(E)-N-(3-(5-(3-Acetamidopropyl)-3,6-dioxopiperazin-2-yl)propyl)-5-hydroxy-3-methylpent-2-enamide

open access: yesMolbank, 2023
The Atacama Desert is an unexplored habitat with interesting possibilities for natural product chemistry due to the adaptations employed by microorganisms to survive the extreme salinity and high UV radiation present.
Gagan Preet   +5 more
doaj   +1 more source

Integrating Molecular Networking and 1H NMR Spectroscopy for Isolation of Bioactive Metabolites from the Persian Gulf Sponge Axinella sinoxea

open access: yesMarine Drugs, 2020
The geographic position, highly fluctuating sea temperatures and hypersalinity make Persian Gulf an extreme environment. Although this unique environment has high biodiversity dominated by invertebrates, its potential in marine biodiscovery has largely ...
Reza Mohsenian Kouchaksaraee   +4 more
doaj   +1 more source

Characterisation of Cooked Cheese Flavour: Non-Volatile Components

open access: yesFoods, 2023
This work examined the role of selected non-volatile compounds in cooked cheese flavour, both as tastants and as precursors of aroma generation in the Maillard reaction.
Rosa C. Sullivan   +5 more
doaj   +1 more source

Diketopiperazine-Based, Flexible Tadalafil Analogues: Synthesis, Crystal Structures and Biological Activity Profile

open access: yesMolecules, 2021
Phosphodiesterase 5 (PDE5) is one of the most extensively studied phosphodiesterases that is highly specific for cyclic-GMP hydrolysis. PDE5 became a target for drug development based on its efficacy for treatment of erectile dysfunction.
Adam Mieczkowski   +12 more
doaj   +1 more source

α-Glucosidase Inhibitors from Two Mangrove-Derived Actinomycetes

open access: yesMolecules, 2023
α-Glucosidase (AGS) inhibitors have been regarded as an ideal target for the management of type 2 diabetes mellitus (T2DM) since they can maintain an acceptable blood glucose level by delaying the digestion of carbohydrates and diminishing the absorption
Xuejun Lu   +11 more
doaj   +1 more source

Chemical Investigation of Diketopiperazines and N-Phenethylacetamide Isolated from Aquimarina sp. MC085 and Their Effect on TGF-β-Induced Epithelial–Mesenchymal Transition

open access: yesApplied Sciences, 2021
Chemical investigations of Aquimarina sp. MC085, which suppressed TGF-β-induced epithelial–mesenchymal transition (EMT) in A549 human lung cancer cells, led to the isolation of compounds 1–3.
Myong Jin Lee   +7 more
doaj   +1 more source

Molecular Networking-Guided Isolation of New Etzionin-Type Diketopiperazine Hydroxamates from the Persian Gulf Sponge Cliona celata

open access: yesMarine Drugs, 2021
The Persian Gulf is a unique and biologically diverse marine environment dominated by invertebrates. In continuation of our research interest in the chemistry and biological activity of marine sponges from the Persian Gulf, we selected the excavating ...
Reza Mohsenian Kouchaksaraee   +4 more
doaj   +1 more source

Enantioselective Synthesis of Hydantoin and Diketopiperazine-Fused Tetrahydroisoquinolines via Pictet–Spengler Reaction

open access: yes, 2019
An enantioselective synthesis of iso-, isothio-, and isoselenohydantoin and diketopiperazine-fused tetrahydroisoquinolines from l-Dopa was reported. The route consists of an Pictet–Spengler reaction of (S)-2-amino-3-(3,4-dimethoxyphenyl)­propanoates with
Jia-Yun Haung (6426347)   +4 more
core   +5 more sources

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