prepared by stepwise elongation and fragment condensation methods, and were used as catalysts in the Julia–Colonna asymmetric epoxidation reaction. The yield and enantioselectivity rose by increasing the number of amino acid units in the catalyst. The enantioselectivity was very sensitive to the reaction solvent. The IR characteristic bands (the amide I region) in CH2Cl2 indicated the soluble catalysts
通过逐步延伸和片段缩合方法制备了含有 Aib 残基的长度限定的有机溶剂可溶性低聚-
L-亮氨酸,并用作 Julia-Colonna 不对称环氧化反应的催化剂。通过增加催化剂中
氨基酸单元的数量来提高产率和对映选择性。对映选择性对反应溶剂非常敏感。
CH2Cl2 中的 IR 特征带(酰胺 I 区)表明可溶性催化剂在溶液中具有螺旋结构。