o-DPPB-Directed Copper-Mediated and -Catalyzed Allylic Substitution with Grignard Reagents
作者:Peter Demel、Manfred Keller、Bernhard Breit
DOI:10.1002/chem.200600225
日期:2006.8.25
explored as a directing leaving group in copper-mediated and copper-catalyzed allylic substitution with Grignard reagents. Complete control of chemo-, regio- and stereoselectivity with complete syn-1,3-chirality transfer was observed as a result of the directed nature of the reaction. No excess of organometallic reagent is required and the directing group can be recovered quantitatively. Coordination
研究了邻二苯基膦基苯甲酰基(o-DPPB)基团作为用格氏试剂在铜介导的和铜催化的烯丙基取代中的直接离去基团。作为反应的定向性质的结果,观察到化学,区域和立体选择性的完全控制以及syn-1,3-手性的完全转移。不需要过量的有机金属试剂,并且可以定量回收导向基团。在固态和溶液中的配位研究表明,两个底物通过铜上导向基团的膦功能键合。溶液中的动态NMR实验与铜的配位体交换过程相一致,这是发展亚化学计量过程的前提。