Diastereoselective Mannich Reaction of Chiral Enolates Formed by Enantioselective Conjugate Addition of Grignard Reagents
作者:Zuzana Galeštoková、Radovan Šebesta
DOI:10.1002/ejoc.201101270
日期:2011.12
Cu–Taniaphos-catalyzed enantioselective addition of Grignard reagents to cyclic enones leads to chiral magnesium enolates. These enolates add to N-protected imines directly, or through in situ transformation to silyl enol ethers. Diastereoselectivity of the addition depends on the nitrogen protecting group of the imine. Diastereoisomers of the resulting β-amino carbonyl compounds can be separated and
Cu – Taniaphos 催化的格氏试剂对映选择性加成到环烯酮导致手性镁烯醇化物。这些烯醇直接添加到 N 保护的亚胺中,或通过原位转化为甲硅烷基烯醇醚。添加的非对映选择性取决于亚胺的氮保护基团。可以分离所得 β-氨基羰基化合物的非对映异构体,并以可接受的产率和高对映体纯度(高达 99:1)获得。