Synthesis and antimicrobial activity of some 2-acetylcyclopent-4-ene-1,3-diones
作者:O. P. Shestak、V. L. Novikov、S. I. Stekhova、I. A. Gorshkova
DOI:10.1007/bf02508410
日期:1999.1
3-diones (II). This series of compounds offer an interesting object for investigation because they are closely related to the relatively rare group of natural cyciopentene 13,13'triketones [ 1 3] and can be used as multipurpose reagents for the synthesis of various carboand heterocyclic compounds. Indeed, even the simplest representative of this series contains 10 (sic!) reactive centers, which is explained
Synthesis of coruscanones A and B, metabolites of Piper coruscans, and related compounds
作者:O. P. Shestak、V. L. Novikov
DOI:10.1007/s11172-010-0048-9
日期:2010.1
Base-catalyzed rearrangements of both individual 4-(acylmethylidene)butenolides and their mixtures prepared by condensation of citraconic anhydride with various phosphoranes occur successfully only in the presence of 5.2% MeONa in MeOH (molar ratio MeONa: substrate ≤ 10: 1, room temperature, 1–2 h). Under these conditions, the yields of 2-cinnamoyl-4-methylcyclopent-4-ene-1,3-dione (coruscanone B)
Photo-induced rearrangement of 2,3-epoxy-1,4-cyclohexanediones was investigated for a synthesis of γ-alkylidene-γ-butyrolactones and γ-alkylidenebutenolides. Irradiation of epoxy diketones 1 and 4 in acetone gave γ-lactones, 2 and 5, and triketones, 3 and 6. On the other hand, in CH2Cl2, EtOAc, or PhH solution epoxy diketones 1 and 4 gave only triketones, 3 and 6. Retro-Diels-Alder reaction of γ-lactones
Probe compound for detecting and isolating enzymes and means and methods using the same
申请人:Helmholtz-Zentrum für Infektionsforschung GmbH
公开号:EP2230312A1
公开(公告)日:2010-09-22
The present invention relates to a probe compound that can comprise any substrate or metabolite of an enzymatic reaction in addition to an indicator component, such as, for example, a fluorescence dye, or the like. Moreover, the present invention relates to means for detecting enzymes in form of an array, which comprises any number of probe compounds of the invention which each comprise a different metabolite of interconnected metabolites representing the central pathways in all forms of life. Moreover, the present invention relates to a method for detecting enzymes involving the application of cell extracts or the like to the array of the invention which leads to reproducible enzymatic reactions with the substrates. These specific enzymatic reactions trigger the indicator (e.g. a fluorescence signal) and bind the enzymes to the respective cognate substrates. Moreover, the invention relates to means for isolating enzymes in form of nanoparticles coated with the probe compound of the invention. The immobilisation of the cognate substrates or metabolites on the surface of nanoparticles by means of the probe compounds allows capturing and isolating the respective enzyme, e.g. for subsequent sequencing.