Synthesis of Paullones with Aminoalkyl Side Chains
摘要:
Paullones 3 and 4 with aminoalkyl side chains in 2- or 3-position were synthesized as derivatives of kenpaullone 1. Both 3 and 4 showed the characteristic CDK1-inhibitory activity of the paullones and a modest antiproliferative activity on cultured human tumor cell lines. Hence, 3 and 4 appear to be suitable tools for affinity studies directed to find additional intracellular paullone targets.
Polymer-bound reagents for the introduction of spacer-modified biotin labels
作者:Claudia Herforth、Philipp Heidler、Stephan Franke、Andreas Link
DOI:10.1016/j.bmc.2004.03.038
日期:2004.6
We have developed a method for the chemoselective introduction of spacer modified biotin labels into unprotected multifunctional amines. A range of novel biotin spacer conjugates attached to a polymer-bound sulfonamide anchor was prepared using established amide bond forming procedures. After chemical transformation of the attachment site by alkylation, the resulting reactive species were utilized as N-selective polymer-supported biotinylation reagents. The labeled compounds, obtained in good to excellent yield and purity, are free of residual biotin and possess a custom tailored distance from the immobilization site being especially suited for the immobilization on streptavidin-functionalized dextran layers of surface plasmon resonance detector chips. In addition, derivatives displaying a phenyl group were synthesized in order to demonstrate the versatility of the procedure for the simultaneous introduction of spacer-modified biotin and a UV-light absorbing moiety. The formation of biotin sulfoxides in the presence of in situ generated peroxides was investigated and is discussed. Our results suggest that this derivatization technique is a useful addition to the existing biotin labeling protocols. (C) 2004 Elsevier Ltd. All rights reserved.
Synthesis of Paullones with Aminoalkyl Side Chains
作者:Karen Wieking、Marie Knockaert、Maryse Leost、Daniel W. Zaharevitz、Laurent Meijer、Conrad Kunick
Paullones 3 and 4 with aminoalkyl side chains in 2- or 3-position were synthesized as derivatives of kenpaullone 1. Both 3 and 4 showed the characteristic CDK1-inhibitory activity of the paullones and a modest antiproliferative activity on cultured human tumor cell lines. Hence, 3 and 4 appear to be suitable tools for affinity studies directed to find additional intracellular paullone targets.
Biotin labelling of amines by polymer-assisted solution-phase synthesis
作者:Abolfasl Golisade、Claudia Herforth、Karen Wieking、Conrad Kunick、Andreas Link
DOI:10.1016/s0960-894x(01)00296-7
日期:2001.7
multifunctional compounds bearing an amino functionality. Biotin was immobilized on aminomethylated polystyrene via the Kenner safety catch linker, activated and subsequently transferred to the amino function of the target compounds chemoselectively, thus avoiding protecting group operations. This approach holds potential for the introduction of spacer-modified biotin derivatives.