Synthesis and in vitro antibacterial activity of oxazolidine LBM-415 analogs as peptide deformylase inhibitors
摘要:
The drug resistant bacteria pose a severe threat to human health. The increasing resistance of those pathogens to traditional antibacterial therapy renders the identification of new antibacterial agents with novel antibacterial mechanisms an urgent need. In this study, a series of (2S)-N-substituted-1-[(formyhydroxyamino) methyl]-1-oxohexyl]-2-oxazolidinecarboxamides were designed, synthesized and evaluated for in vitro antibacterial activity. Most of these compounds displayed good activities against Gram-positive organisms comparable to reference agent LBM-415. Crown Copyright (C) 2010 Published by Elsevier Ltd. All rights reserved.
Use of functionalized onium salts as a soluble support for organic synthesis
申请人:Vaultier Michel
公开号:US20070043234A1
公开(公告)日:2007-02-22
The invention relates to the use of a onium salt functionalized by at least one organic function, as a soluble support, in the presence of at least one organic solvent, for organic synthesis of a molecule, in a homogenous phase, by at least one transformation of said organic function. The onium salt enables the synthesized molecule to be released. The onium salt is present in liquid or solid form at room temperature and corresponds to formula A
1
+
, X
1
−
, wherein A
1
+
represents a cation and X
1
−
represents an anion.
Enantioselective syntheses of two 5, 9E diastereomers of 223V, an alkaloid from the poison frog Dendrobates pumilio
作者:Naoki Toyooka、Hideo Nemoto、Masashi Kawasaki、H. Martin Garraffo、Thomas F. Spande、John W. Daly
DOI:10.1016/j.tet.2004.11.060
日期:2005.1
Enantioselective syntheses of two 5, 9E diastereomers (1 and 2) of 223V (3) are described. Neither corresponded on GC–MS and GC-FTIR analyses to alkaloid 223I, previously tentatively proposed to be a 5,8-disubstituted indolizidine of the unusual 5, 9E relative stereochemistry. Synthetic (−)-(5, 9Z)-5-n-propyl-8-n-butylindolizidine (3) corresponds on GC–MS and GC-FTIR analyses to the natural indolizidine
Ruthenium-catalysed synthesis of 2- and 3-substituted quinolines from anilines and 1,3-diols
作者:Rune Nygaard Monrad、Robert Madsen
DOI:10.1039/c0ob00676a
日期:——
as well as naphthylamines were shown to participate in the heterocyclisation. In the 1,3-diol a substituent was allowed in the 1- or the 2-position giving rise to 2- and 3-substituted quinolines, respectively. The best results were obtained with 2-alkyl substituted 1,3-diols to afford 3-alkylquinolines. The mechanism is believed to involve dehydrogenation of the 1,3-diol to the 3-hydroxyaldehyde which
The reactions of a variety of 1,3-bis(phenylthio)propanes with butyllithium have been shown to produce cyclopropyl phenyl sulfides in good to high yields. A new and convenient in situ preparation of 1-lithiocyclopropyl phenyl sulfide can be readily carried out by treating 1,3-bis(phenylthio)propane with 2 equiv. of butyllithium at 0 °C in THF. The reaction with electrophiles proceeds in good yield
Two homologous series of carborane-containing dioxanes 1[n] and 2[n] (n = 1–10) were prepared and their mesogenic properties investigated. All compounds exhibit nematic behavior and three members of series 2[n] show an E phase. Numerical analysis of the clearing temperatures gave a limiting value TNI(∞) of 89 °C for series 2[n] and indicated conformational flexibility of the dioxane ring. Investigations of three-ring derivative 1[4] gave Δn = 0.17, S = 0.53, and Δε = +0.4 ± 0.1 at 85 °C. Extrapolation of dielectric data for dilute solutions of 1[4] in 6-CHBT gave Δε = +0.4 ± 0.25 at 24 °C. Modelling of dielectric results with the Maier–Meier equation demonstrated that conformers with a higher β angle are preferred, which is consistent with conformational selection for the most elongated conformers.