Synthesis and antitumor-evaluation of cyclopropyl-containing combretastatin analogs
作者:Rita Fürst、István Zupkó、Ágnes Berényi、Gerhard F. Ecker、Uwe Rinner
DOI:10.1016/j.bmcl.2009.10.064
日期:2009.12
Several derivatives of combretastatin have been prepared bearing a cyclopropyl unit instead of the natural occurring cis-double bond. Final products and synthetic intermediates were evaluated for their cytotoxic properties in two human cancer cell lines. (C) 2009 Elsevier Ltd. All rights reserved.
An Amine-Assisted Ionic Monohydride Mechanism Enables Selective Alkyne <i>cis</i>-Semihydrogenation with Ethanol: From Elementary Steps to Catalysis
protonolysis of the Ir–C(vinyl) bond. Instead, mechanistic data are consistent with an anion-involved alcoholysis pathway involving ionization of (NCP)IrCl(vinyl) via EtOH-for-Cl substitution and reversible protonation of Cl– ion with an Ir(III)-bound EtOH, followed by β-H elimination of the ethoxy ligand and C(vinyl)–H reductive elimination. The use of an amine is key to the monohydride mechanism by promoting