Matching the Chirality of Monodentate N-Heterocyclic Carbene Ligands: A Case Study on Well-Defined Palladium Complexes for the Asymmetric α-Arylation of Amides
作者:Xinjun Luan、Ronaldo Mariz、Carine Robert、Michele Gatti、Sascha Blumentritt、Anthony Linden、Reto Dorta
DOI:10.1021/ol8021808
日期:2008.12.18
N-Heterocyclic carbene ligands derived from C(2)-symmetric diamines with naphthyl side chains are introduced as chiral monodentate ligands, and their palladium complexes (NHC)Pd(cin)Cl are prepared. These compounds exist as a mixture of diastereomers, and the palladium complexes can be successfully separated and their absolute stereochemistry assigned. When used in the asymmetric intramolecular alpha-arylation
引入具有萘基侧链的C(2)-对称二胺衍生的N-杂环卡宾配体作为手性单齿配体,并制备其钯配合物(NHC)Pd(cin)Cl。这些化合物以非对映异构体的混合物形式存在,并且可以成功分离钯配合物并指定其绝对立体化学。当用于酰胺的不对称分子内α-芳基化反应时,当正确匹配NHC配合物的手性时,可以高收率和选择性获得具有季碳中心的羟吲哚。