New Mixed Li/Mg and Li/Mg/Zn Amides for the Chemoselective Metallation of Arenes and Heteroarenes
作者:Christoph J. Rohbogner、Stefan H. Wunderlich、Giuliano C. Clososki、Paul Knochel
DOI:10.1002/ejoc.200801277
日期:2009.4
New mixed Li/Mg and Li/Mg/Zn amides have been synthesized starting from readily prepared secondary amines. They allow a highly chemoselective directed magnesiation or zincation of various polyfunctional aromatics and heteroaromatics. The kinetic basicity, solubility and stability of these new bases have been compared with those of the corresponding 2,2,6,6-tetramethylpiperamide-derived bases.(© Wiley-VCH
新的混合 Li/Mg 和 Li/Mg/Zn 酰胺已从易于制备的仲胺开始合成。它们允许各种多官能芳烃和杂芳烃的高度化学选择性定向镁化或锌化。这些新碱的动力学碱度、溶解度和稳定性与相应的 2,2,6,6-四甲基哌酰胺衍生碱进行了比较。 (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009 )