نتایج جستجو برای: stereoisomeric group
تعداد نتایج: 979523 فیلتر نتایج به سال:
The title compound, C(12)H(12)BrNO(2)S, was isolated after direct irradiation (hν 350 nm, hexa-ne) of a mixture of stereoisomeric sulfonamides containing a vicinal dibromide and a conjugated diene. This product is one of a group of substrates that has contributed to our understanding of the photoreactivity patterns of non-bridged sulfonamides. The crystal structure was determined from a non-mer...
Oxidation of low-density lipoproteins (LDL) plays a crucial role in inflammatorydiseases and aging. The main oxidation products of LDL are stereoisomeric 9-hydroxy-10,12-octadecadienoic acids (9-HODEs) and 13-hydroxy-9,11-octadecadienoic acids (13-HODEs). Nevertheless the content of HODEs in natural oxidized LDL is low compared to other components, thus determination of HODEs requires a sample ...
Cochinmicins I, II, III are novel peptolides produced in submerged-fermentation cultures of Microbispora sp. ATCC 55140. These closely related compounds are separated by HPLC and are novel competitive endothelin antagonists. Cochinmicins II and III are stereoisomeric to each other. Cochinmicin I is the deschloro analog of cochinmicin III.
□S Influence of the Stereoisomeric Position of the Reactive Acetate Groups of the Benzo[b]Acronycine derivative S23906-1 on Its DNA Alkylation, Helix-Opening, Cytotoxic, and Antitumor Activities Sabine Depauw, Thomas Gaslonde, Stéphane Léonce, Laurence Kraus-Berthier, William Laine, Gaëlle Lenglet, Angèle Chiaroni, Bruno Pfeiffer, Christian Bailly, Sylvie Michel, François Tillequin, Alain Pierr...
2. Comparisons with synthetic 3-hydroxyand 4-hydroxy-pipecolic acids indicated that the isolated imino acid may not be 4-hydroxypipecolic acid, but 3-hydroxypipecolic acid. Strictly identical behaviour of natural and synthetic 3-hydroxypipecolic acid could not be demonstrated since the two substances differed in stereoisomeric composition. 3. 3-Hydroxyand 4-hydroxy-pipecolic acids have been syn...
Deoxynucleoside kinases catalyze the 5'-phosphorylation of 2'-deoxyribonucleosides with nucleoside triphosphates as phosphate donors. One of the cellular kinases, deoxycytidine kinase (dCK), has been shown to phosphorylate several L-nucleosides that are efficient antiviral agents. In this study we investigated the potentials of stereoisomers of the natural deoxyribonucleoside to serve as substr...
An efficient, quantitative deracemization strategy for optically inactive allylic cycloalkanols has been achieved using the biphasic halogenative semi-pinacol reaction protocol. The resultant β-halo spiroketones, containing three contiguous stereogenic centers, were easily recovered with high diastereomeric and enantiomeric purities following conventional silica gel chromatography. The opticall...
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