TADDOL-Based Phosphane-Phosphite Ligands in Enantioselective Cu-Catalyzed Grignard 1,4-Additions Followed by Mannich-Type Alkylations
作者:Michal Drusan、Wibke Lölsberg、Andrea Škvorcová、Hans-Günther Schmalz、Radovan Šebesta
DOI:10.1002/ejoc.201200729
日期:2012.11
Copper(I) complexes of TADDOL-based phosphane–phosphite ligands catalyze enantioselective conjugate additions of various Grignard reagents to cyclic enones. Through trapping of the resulting chiral magnesium enolates with N-benzylidene-4-methylbenzenesulfonamide (as an imine) in one-pot procedures, the corresponding Mannich products (i.e., β-aminocarbonyl compounds) were obtained in good yields and
基于 TADDOL 的磷烷-亚磷酸酯配体的铜 (I) 配合物催化各种格氏试剂对环烯酮的对映选择性共轭加成。通过在一锅法中用 N-亚苄基-4-甲基苯磺酰胺(作为亚胺)捕获所得的手性镁烯醇化物,以良好的收率和高对映体纯度获得了相应的曼尼希产物(即 β-氨基羰基化合物),尽管只有低的非对映选择性。