Propargylglycine-based antimicrobial compounds are targets of TolC-dependent efflux systems in Escherichia coli
摘要:
A library of novel L-propargylglycine-based compounds were designed and synthesized with the goal of inhibiting the growth of Gram-negative bacteria by targeting LpxC, a highly conserved Gram-negative enzyme which performs an essential step in the lipid A biosynthetic pathway. These compounds were designed with and without a nucleoside and had varying tail structures, which modulate their lipophilicity. The synthetic scheme was improved compared to previous methods: a methyl ester intermediate was converted to a hydroxamic acid, which obviated the need for a THP protecting group and improved the yields and purity of the final compounds. Antimicrobial activity was observed for non-nucleoside compounds containing a phenyl propargyl ether tail (5) or a biphenyl tail (6). An MIC of 16 mu g/mL was achieved for 6 in Escherichia coli, but inhibition was only possible in the absence of TolC-mediated efflux. Compound 5 had an initial MIC > 160 mu g/mL in E. coli. Enhancing outer membrane permeability or eliminating efflux reduced the MIC modestly to 100 mu g/mL and 80 mu g/mL, respectively. These results highlight the importance of hydrophobicity of this class of compounds in developing LpxC inhibitors, as well as the design challenge of avoiding multidrug efflux activity.
Chemoenzymatic Synthesis of Triazole-Linked Glycopeptides
作者:Floris Rutjes、Stan Groothuys、Brian Kuijpers、Peter Quaedflieg、Harlof Roelen、Roel Wiertz、Richard Blaauw、Floris van Delft
DOI:10.1055/s-2006-942509
日期:——
Triazole-linked glycopeptides are prepared by C-terminal elongation of glycoamino acids with proteinogenic amino acids following a chemical or enzymatic coupling protocol. Two orthogonal routes for a chemoenzymatic strategy were explored, involving a click-reaction before amide bond formation or in reverse order. It was found that enzymatic peptide coupling under the influence of alcalase proceeds cleanly and in high yields, while the resulting dipeptides can be efficiently clicked to acetylene- or azide-containing sugars.
The invention provides a compound of formula (I) or a pharmaceutically acceptable salt thereof, wherein R is C1-4 alkyl useful in the treatment of diseases and conditions for which antagonism of NK1 receptor is beneficial.
Sonogashira Reaction of Bromofluoropyridinaldoxime Nuclei: Convergent Synthesis of Functionalized 2- and 3-Fluoropyridine Scaffolds
作者:Jagadeesh Yerri、Rachid Baati
DOI:10.1002/ejoc.201800608
日期:2018.8.15
The palladium catalyzed Sonogashira cross‐coupling of bromofluoropyridinaldoxime with highly functionalized alkynes investigated in this study is fully compatible with unprotected sensitive aldoxime and affords representative underexplored new scaffolds.
their prevalence in nature and their broad utility in pharmaceutical industry. Reported herein is an unprecedented noble‐metal‐ and oxidant‐free electrochemical method for the coupling of (hetero)arylamines with tethered alkynes to synthesize highly functionalized indoles, as well as the more challenging azaindoles.
6-SUBSTITUTED 3-FLUORO-2-PYRIDINALDOXIME, 3-FLUORO-2-PYRIDINE HYDROXAMIC ACID, AND 3-FLUORO-2-PYRIDINAMIDOXIME SCAFFOLDS
申请人:CENTRE NATIONAL DE LA RECHERCHE SCIENTIFIQUE
公开号:EP3473618A1
公开(公告)日:2019-04-24
The present invention relates to a compound of formula (I), as well as to a process for preparing the compounds of formula (I) by a chemoselective Sonogashira reaction.
It also relates to a pharmaceutical composition comprising at least one compound of formula (I) and at least one pharmaceutically acceptable support.
Finally, it relates to the use of such a compound as a medicine, preferably in the treatment of a nervous and/or respiratory failure due to intoxication with at least one organophosphorous nerve agent; in the treatment of neurological diseases such as Alzheimer's disease; and/or in the treatment of cancer; and/or for use as antiviral drug.