Asymmetric electrophilic α-amination of aldehydes and ketones is described using trans-3-tert-butoxy-Lproline and trans-4-tert-butoxy-L-proline as efficient catalysts. Good yields and high enantioselectivities are obtained working at 0°C or at room temperature with a catalyst loading of only 5 mol%.
以反式-3-叔丁氧基-
L-脯氨酸和
反式-4-叔丁氧基-L-脯氨酸为高效催化剂,描述了醛和酮的不对称亲电α-
氨基化反应。在 0°C 或室温条件下,催化剂负载量仅为 5 摩尔%,即可获得良好的产率和较高的对映选择性。