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。
Hydrolysis of polypeptide esters with tetrabutylammonium hydroxide
摘要:
Tetrabutylammonium hydroxide is effective in hydrolysis of polypeptide esters to the corresponding acids with minimum racemization of the stereogenic centers at the alpha-positions. It is especially effective in hydrolysis of non-polar polypeptide esters that are insoluble in most common solvents. (C) 1998 Elsevier Science Ltd. All rights reserved.