A green way to amino acids: α‐Tetrasubstituted α‐amino acid derivatives are formed in high yield and enantioselectivity by using a Rh‐catalyzed enantioselective alkynylation of α‐ketiminoesters. This reaction, which involves a proton transfer and can be conducted at room temperature, has high substrate scope (see scheme; Cbz=benzyloxycarbonyl, Fmoc=9‐fluorenylmethyloxycarbonyl).
氨基酸的绿色方法:通过使用Rh催化的α-酮亚
氨基酸酯对映选择性炔基化反应,可以高产率和对映选择性地形成α-四取代的
α-氨基酸衍
生物。该反应涉及质子转移,可以在室温下进行,具有较高的底物范围(参见方案; Cbz =苄氧羰基,Fmoc = 9-
芴基甲氧羰基)。