Stereoselective Syntheses of Dihydroxerulin and Xerulinic Acid, Anti-Hypocholesterolemic Dyes from the Fungus<i>Xerula melanotricha</i>
作者:Achim Sorg、Konrad Siegel、Reinhard Brückner
DOI:10.1002/chem.200400913
日期:2005.2.18
inhibitors of the biosynthesis of cholesterol, were synthesized in a convergent and perfectly stereoselective manner. In the key step, bromobutenolide 6 (obtained from levulinic acid in two steps) was coupled with either of the novel bis(stannanes) trans,cis,trans-35 or trans,trans,trans-35 [each accessible from 3-(tributylstannyl)allyl alcohol (17) in four steps], giving gamma-alkylidenebutenolide trans
Synthesis and cytotoxic evaluation of halogenated furanones
作者:Víctor A. Castro-Torres、Nadia J. Jacobo-Herrera、Lidia Díaz-Sánchez、Leticia Rocha-Zavaleta、Patricia García-López、Mariano Martínez-Vázquez
DOI:10.1007/s00706-020-02708-0
日期:2020.12
found that the cytotoxic furanones induced lipid peroxidation, determined by TBARS assay. Thus, cytotoxicity of the active compounds could be associated with ROS production. Additionally, it must be taken into account that all cytotoxic compounds contain an electrophilic carbon atom in position 4, which can explain, through a non-specific reactivity with nucleophiles, the cytotoxic activity of these
Design and synthesis of aryl-substituted pyrrolidone derivatives as quorum sensing inhibitors
作者:Zhiyang Liu、Panpan Zhang、Yinhui Qin、Nan Zhang、Yuetai Teng、Henrietta Venter、Shutao Ma
DOI:10.1016/j.bioorg.2020.104376
日期:2020.12
study we evaluated the diverse quorum sensing inhibition activities of different biaromatic furanones and brominated pyrrolones. On this basis, we further designed and synthesized a new series of aryl-substituted pyrrolones 12a-12f. In the quorum sensing inhibition assay, compound 12a showed improved characteristics and low toxicity against human hepatocellular carcinoma cell. In particular, it can inhibit
A method for the preparation of a compound of formula (II) wherein R
1
and R
2
are independently H, alkyl, alkoxy, oxoalkyl, alkenyl, aryl or arylalkyl whether unsubstituted or substituted, optionally interrupted by one or more hetero atoms, straight chain or branched chain, hydrophilic, hydrophobic or fluorophilic; R
3
, R
4
, R
5
and R
6
are independently or all hydrogen or halogen; provided that at least two of the R
3
, R
4
, R
5
and R
6
are halogens.
Variation in the regioselectivity of levulinic acid bromination in ionic liquids
作者:Alexander G. Zavozin、Natalya E. Kravchenko、Nikolay V. Ignat’ev、Sergei G. Zlotin
DOI:10.1016/j.tetlet.2009.11.097
日期:2010.1
The reaction of levulinicacid and its esters with bromine in ionic liquids results in the formation of 3-bromo derivatives as the major products and not the 5-bromo substituted isomers, which are typically formed in organic solvents. The bromination of levulinicacid in ionic liquids in the presence of urea leads to the formation of 5-bromolevulinic acid.