Synthesis of<i>S</i>- and<i>N</i>-Functionalized Dithiocarbamates from Cyclic Sulfates
作者:Jose Parada-Aliste、Alicia Megia-Fernandez、Diego De la Torre-Gonzalez、Fernando Hernandez-Mateo、Francisco Santoyo-Gonzalez
DOI:10.1002/ejoc.201201522
日期:2013.6
This chelating capability allowsthem to be used as antidotes against metal poisoning, inanalytical determination, or in waste water treatment ofheavy metals. Furthermore, this strong binding capacitymeans that numerous DTC metal complexes can act as in-hibitors of enzymes, with a profound effect on biologicalsystems.
Inhibition of S-ribosylhomocysteinase (LuxS) by substrate analogues modified at the ribosyl C-3 position
作者:Stanislaw F. Wnuk、Jenay Robert、Adam J. Sobczak、Brandon P. Meyers、Venkata L.A. Malladi、Jinge Zhu、Bhaskar Gopishetty、Dehua Pei
DOI:10.1016/j.bmc.2009.07.057
日期:2009.9
S-Ribosylhomocysteinase (LuxS) catalyzes the cleavage of the thioether bond of S-ribosylhomocysteine (SRH) to produce homocysteine and 4,5-dihydroxy-2,3-pentanedione (DPD), which is the precursor of type 2 autoinducer for bacterial cell-cell communication. In this work, we have synthesized several SRH analogues modi. ed at the ribose C3 position as potential inhibitors of LuxS. While removal or methylation of the C3-OH resulted in simple competitive inhibitors of moderate potency, inversion of the C3 stereochemistry or substitution of. uorine for C3-OH resulted in slow-binding inhibitors of improved potency. The most potent inhibitor showed a K*(I) value of 0.43 mu M. (C) 2009 Elsevier Ltd. All rights reserved.
Synthesis of Sulfonium Sulfate Analogues of Disaccharides and Their Conversion to Chain-Extended Homologues of Salacinol: New Glycosidase Inhibitors
作者:Blair D. Johnston、Henrik H. Jensen、B. Mario Pinto
DOI:10.1021/jo052252u
日期:2006.2.1
[graphics]Four chain extended homologues of salacinol, a naturally occurring glycosidase inhibitor, were prepared for evaluation as inhibitors of glucosidase enzymes involved in the breakdown of carbohydrates. The syntheses involved the reactions of 1,4-anhydro-2,3,5-tri-O-benzyl-4-thiO-D-arabinitol with cyclic sulfate derivatives of different monosaccharides. Debenzylation of the products afforded the novel sulfonium sulfate derivatives Of D-glucose, D-galactose, D-arabinose, and D-Xylose that are of interest in their own right as glycosidase inhibitors. Reduction to the corresponding alditols then afforded the homologues of salacinol containing polyhydroxylated, acyclic chains of 5- and 6-carbons, differing in stereochemistry at the stereogenic centers. Three of the chain-extended homologues inhibited recombinant human maltase glucoamylase, one of the key intestinal enzymes involved in the breakdown of glucose oligosaccharides in the sinall intestine, with K-i values in the low microinolar range, of approximately the saine inagnitude as salacinol, thus providing lead candidates for the treatment of Type 2 diabetes.