- Nucleophilic reactions of ethyl (Z)-2?bromo-4,4,4-trifluorobut-2-enoate: One molecule – various heterocycles
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The synthetic approach to different fluorinated heterocycles based on ethyl (Z)-2?bromo-4,4,4-trifluorobut-2-enoate and binucleophiles is described. The assembly of all heterocyclic structures proceeds through the formation of the product of conjugate nucleophilic addition as a key step.
- Kobelevskaya, Valentina A.,Rulev, Alexander Yu.,Tyumentsev, Ilya A.,Ushakov, Igor A.
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supporting information
(2022/01/03)
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- Structure-activity relationships in a new class of non-substrate-like covalent inhibitors of the bacterial glycosyltransferase LgtC
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Lipooligosaccharide (LOS) structures in the outer core of Gram-negative mucosal pathogens such as Neisseria meningitidis and Haemophilus influenzae contain characteristic glycoepitopes that contribute significantly to bacterial virulence. An important example is the digalactoside epitope generated by the retaining α-1,4-galactosyltransferase LgtC. These digalactosides camouflage the pathogen from the host immune system and increase its serum resistance. Small molecular inhibitors of LgtC are therefore sought after as chemical tools to study bacterial virulence, and as potential candidates for anti-virulence drug discovery. We have recently discovered a new class of non-substrate-like inhibitors of LgtC. The new inhibitors act via a covalent mode of action, targeting a non-catalytic cysteine residue in the LgtC active site. Here, we describe, for the first time, structure-activity relationships for this new class of glycosyltransferase inhibitors. We have carried out a detailed analysis of the inhibition kinetics to establish the relative contribution of the non-covalent binding and the covalent inactivation steps for overall inhibitory activity. Selected inhibitors were also evaluated against a serum-resistant strain of Haemophilus influenzae, but did not enhance the killing effect of human serum.
- Xu, Yong,Cuccui, Jon,Denman, Carmen,Maharjan, Tripty,Wren, Brendan W.,Wagner, Gerd K.
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p. 2973 - 2983
(2018/03/29)
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- Cyclocondensation of Alkylhydrazines and β-Substituted Acetylenic Esters: Synthesis of 3-Hydroxypyrazoles
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Addition of monosubstituted alkylhydrazines to acetylenic esters with either electron-withdrawing or sterically bulky β-substituents afforded 1-alkyl-3-hydroxy-5-substituted-pyrazoles 1 as the major regioisomeric product.By comparison, the classical cyclo
- Hamper, Bruce C.,Kurtzweil, Mitchell L.,Beck, James P.
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p. 5680 - 5686
(2007/10/02)
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