Methanoprolines are found to be catalysts for the Hajos–Parrish–Eder–Sauer–Wiechert reaction.[1]cis-4,5-Methanoproline exhibits catalytic ability similar to proline (86% yield, 93% ee), whereas the trans-4,5-methanoproline is less selective (67% yield, 83% ee) and shows less acceleration. The reaction was also studied with hybrid density functional theory (B3LYP). The nearly planar cis-4,5-methanoproline
甲基脯
氨酸被发现是Hajos-Parrish-Eder-Sauer-Wiechert反应的催化剂。[1]顺式-4,5-甲基脯
氨酸显示出与脯
氨酸相似的催化能力(86%产率,93%ee),而反式-4,5-甲基脯
氨酸的选择性较低(67%产率,83%ee),并且显示较少加速。还使用杂化密度泛函理论(B3LYP)研究了该反应。与
金字塔形的反式-4,5-甲氧基脯
氨酸相比,近乎平面的顺式-4,5-甲氧基脯
氨酸胺更好地反映了过渡态的平面
亚胺。这种构象差异是所观察到的更高的对映体选择性和顺式催化性能增强的原因。-4,5-甲基脯
氨酸。