Regio- and Chemoselective Multiple Functionalization of Pyrimidine Derivatives by Selective Magnesiations using TMPMgCl·LiCl
作者:Marc Mosrin、Paul Knochel
DOI:10.1021/ol800790g
日期:2008.6.1
Successive regio- and chemoselective magnesiations of pyrimidines using TMPMgCl center dot LiCl furnish, after trapping with various electrophiles, highly functionalized derivatives in good to excellent yields. Applications to the synthesis of antiviral and anti-inflammatory agents such as p38 and sPLA2 kinase inhibitors are reported.
Direct Zincation of Functionalized Aromatics and Heterocycles by Using a Magnesium Base in the Presence of ZnCl<sub>2</sub>
作者:Zhibing Dong、Giuliano C. Clososki、Stefan H. Wunderlich、Andreas Unsinn、Jinshan Li、Paul Knochel
DOI:10.1002/chem.200801558
日期:2009.1.2
A wide range of polyfunctional aryl and heteroaryl zinc reagents were efficiently prepared in THF by using (TMP)2Mg⋅2 LiCl (TMP=2,2,6,6‐tetramethylpiperamidyl) in the presence of ZnCl2. The possible pathways of this metalation procedure as well as possible reactive intermediates are discussed. This experimental protocol expands the tolerance of functional groups and allows an efficient zincation of