The present work demonstrates a CuCl and anionic chiral cobalt(III)‐catalyzed enantioselective ring‐opening reaction. The small‐size, ligand‐free copper species enabled the cross‐coupling of iodonium salts with a series of bulky aromatic amines in high ee values. The chiral cobalt(III) anion causes appreciable chemical shift changes of cyclic diaryliodoniums in 1H NMR spectra.
本工作证明了CuCl和阴离子手性钴(III)催化的对映选择性开环反应。小尺寸,无配体的铜物质使碘鎓盐与一系列高ee值的笨重芳族胺交叉偶联。手性钴(III)阴离子在1 H NMR光谱中引起环状二芳基碘鎓的明显化学位移变化。
A novel Pd-catalyzed cyclization reaction of ureas for the synthesis of dihydroquinazolinone p38 kinase inhibitors
作者:Achim Schlapbach、Richard Heng、Franco Di Padova
DOI:10.1016/j.bmcl.2003.11.006
日期:2004.1
A series of potent p38 inhibitors based on the dihydroquinazoline scaffold was synthesized using a novel Pd-catalyzed cyclization reaction of aryl-benzyl ureas. Optimization of this compound class led to compound 20, which inhibits p38alpha in vitro with IC50 = 14 nM and is active in the mouse TNFalpha-release model. (C) 2003 Elsevier Ltd. All rights reserved.
Regio- and Stereoselective Incorporation of a<sup>13</sup><i>C</i>Nuclide into D-<i>ribo</i>-Phytosphingosine<i>via</i>SmI<sub>2</sub>-Mediated C–C Formation with<sup>13</sup><i>C</i>-Labeled Isocyanide
作者:Masahiro Murakami、Hajime Ito、Yoshihiko lto
DOI:10.1246/cl.1996.185
日期:1996.3
Preparation of a 13C-labeled isocyanide and its application to the totalsynthesis of [2-13C]D-ribo-C18-phytosphingosine are described. The synthesis of the labeled phytosphingosine is based on the use of the isocyanide as a 13CH–NH2 precursor in the SmI2-mediated three-component coupling reaction, wherein regio- and stereoselective incorporation of a 13C nuclide in the carbon skeleton is achieved