Results 91 to 100 of about 158,943 (323)
[1,3]/[1,4]-Sulfur atom migration in β-hydroxyalkylphosphine sulfides
Beilstein Journal of Organic Chemistry, 2020 β-Hydroxyalkylphosphine sulfides undergo [1,3]- or [1,4]-sulfur atom phosphorus-to-carbon migration in the presence of Lewis or Brønsted acids. The direction of sulfur atom migration depends on the type of acid used for the reaction. In the presence of a
Katarzyna Włodarczyk +2 more
doaj +1 more source
Molecules, 2021 2,5-diketopiperazines (DKPs) are cyclic dipeptides ubiquitously found in nature. In particular, cyclo(Phe-Pro), cyclo(Leu-Pro), and cyclo(Val-Pro) are frequently detected in many microbial cultures.
Alison Domzalski +6 more
doaj +1 more source
On biological homochirality [PDF]
, 2009 Generalizing Landau's spontaneous symmetry breaking arguments using the standard groupoid approach to stereochemistry allows reconsideration of the origin of biological homochirality.
Rodrick Wallace
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Diatoms synthesize sterols by inclusion of animal and fungal genes in the plant pathway [PDF]
, 2020 Diatoms are ubiquitous microalgae that have developed remarkable metabolic plasticity and gene diversification. Here we report the first elucidation of the complete biosynthesis of sterols in the lineage.
, Angela +7 more
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Marine Drugs, 2022 NMR data prediction is increasingly important in structure elucidation. The impact of force field selection was assessed, along with geometry and energy cutoffs.
Cristina Cuadrado +2 more
doaj +1 more source
Life's Chirality From Prebiotic Environments [PDF]
, 2012 A key open question in the study of life is the origin of biomolecular homochirality: almost every life-form on Earth has exclusively levorotary amino acids and dextrorotary sugars. Will the same handedness be preferred if life is found elsewhere? We review some of the pertinent literature and discuss recent results suggesting that life's homochirality
arxiv +1 more source
New Antibacterial Diterpenoids from the South China Sea Soft Coral Klyxum molle
Marine Drugs, 2023 Fifteen new diterpenoids, namely xishaklyanes A-O (1–15), along with three known related ones (16–18), were isolated from the soft coral Klyxum molle collected from Xisha Islands, South China Sea.
Jia-Dong Yu +5 more
doaj +1 more source
Absolute Stereochemistry of Ulapualide A. [PDF]
ChemInform, 2004 [structure: see text] The structure of ulapualide A (1) has been solved by X-ray crystallography in a complex with G-actin. The stereochemical configuration was assigned as 3S,9S,22S,23R,24S,26S,27S,31R,32R,33R.
Gerard Marriott +3 more
openaire +4 more sources
A Palladium-Catalyzed Vinylcyclopropane (3 + 2) Cycloaddition Approach to the Melodinus Alkaloids [PDF]
, 2011 A palladium-catalyzed (3 + 2) cycloaddition of a vinylcyclopropane and a β-nitrostyrene is employed to rapidly assemble the cyclopentane core of the Melodinus alkaloids.
Goldberg, Alexander F. G. +1 more
core +2 more sources
Chiral drugs : one drug or two? : Clinical pharmacology through the looking glass : reflections on the racemate vs enantiomer debate [PDF]
, 1994 Most of the synthetic chiral agents administered as drugs are still marketed as racemic mixtures. Such drug enantiomers can differ substantially in their pharmacological, pharmacokinetic and toxic properties.
Mifsud, Janet
core