申请人:GELLMAN Samuel Helmer
公开号:US20130030210A1
公开(公告)日:2013-01-31
The invention provides novel compounds and methods to carry out organocatalytic Michael additions of aldehydes to nitroethylene catalyzed by a proline derivative to provide α-substituted-γ-nitroaldehydes. The reaction can be rendered enantioselective when a chiral pyrrolidine catalyst is used, allowing for Michael adducts in nearly optically pure form (e.g., 96-99% e.e.). The Michael adducts can bear a single substituent or dual substituents adjacent to the carbonyl. The Michael adducts can be efficiently converted to protected γ
2
-amino acids, which are essential for systematic conformational studies of γ-peptide foldamers.
本发明提供了一种新型化合物和方法,用于通过脯氨酸衍生物催化的醛类对硝基乙烯进行有机催化Michael加成,从而提供α-取代-γ-硝基醛。当使用手性吡咯烷催化剂时,反应可以变得对映选择性,允许获得几乎光学纯的Michael加合物(例如,96-99%e.e.)。Michael加合物可以带有一个或两个邻位于羰基的取代基。Michael加合物可以有效地转化为受保护的γ2-氨基酸,这对于γ-肽折叠体的系统构象研究至关重要。