Enantioselective Pd-catalyzed allylic amination with self-assembling and non-assembling monodentate phosphine ligands
作者:Mandy-Nicole Birkholz、Natalia V. Dubrovina、Ivan A. Shuklov、Jens Holz、Rocco Paciello、Christoph Waloch、Bernhard Breit、Armin Börner
DOI:10.1016/j.tetasy.2007.08.026
日期:2007.9
New chiral phospholanes were prepared by coupling of bromo-substituted heterocycles with the enantiopure, building block (2R,5R)-2,5-dimethyl-1-chlorophospholane. Some of the new phosphine ligands have the potential for self-assembling via hydrogen bondings in a metal complex. By application of these and related ligands in the palladium catalyzed allylic amination reaction, high enantioselectivities
通过将溴取代的杂环与对映纯的结构单元(2 R,5 R)-2,5-二甲基-1-氯膦烷偶联制备新的手性膦酸酯。一些新的膦配体具有通过金属络合物中的氢键自组装的潜力。通过在钯催化的烯丙基胺化反应中应用这些和相关的配体,可以实现高对映选择性(最高99%)。分析了环状膦配体的构造对对映选择性的影响。