Highly Diastereo- and Enantioselective Mannich Reactions of Synthetically Flexible Ketimines with Secondary Amine Organocatalysts
作者:Taichi Kano、Sunhwa Song、Yasushi Kubota、Keiji Maruoka
DOI:10.1002/anie.201107375
日期:2012.1.27
High selectivity: A highly diastereo‐ and enantioselective Mannich reaction between a synthetically flexible ketimine and aldehydes has been developed. The syn‐ or anti‐Mannich products contain tetrasubstituted chiral carbon centers and were obtained with almost complete stereoselectivity by using either L‐proline or an axially chiral aminosulfonamide, respectively, as the catalyst (see scheme, Tf
高选择性:合成柔性酮亚胺和醛之间具有高度非对映和对映选择性的曼尼希反应。该顺式-或反-Mannich产品含有四取代的手性碳中心,通过使用具有几乎完全的立体选择性获得大号-脯氨酸或轴向手性氨基磺酰胺,分别作为催化剂(参见方案,TF =三氟甲磺酰基)。