DBU-Catalyzed transprotection of N-Fmoc-cysteine di- and tripeptides into S-Fm-cysteine di- and tripeptides
作者:Alan R. Katritzky、Nader E. Abo-Dya、Abdelmotaal Abdelmajeid、Srinivasa R. Tala、M. S. Amine、Said A. El-Feky
DOI:10.1039/c0ob00663g
日期:——
The transprotection of N-Fmoc-cysteine containing di- and tripeptides possessing a free SH group to produce the corresponding S-Fm-cysteine di- and tripeptides bearing a free amino group is accomplished efficiently with DBU in dry THF. The N-Fmoc to S-Fm transformation mechanism is discussed. S-Fm-Cysteine di- and tripeptides readily form amide bonds on coupling with N-(Pg-α-aminoacyl)benzotriazoles and N-(Pg-α-dipeptidoyl)benzotriazoles to give larger peptides.
在干燥的四氢呋喃中,用 DBU 可以高效地对含有游离 SH 基团的 N-Fmoc-半胱氨酸二肽和三肽进行反保护,生成相应的含有游离氨基的 S-Fm-半胱氨酸二肽和三肽。本文讨论了 N-Fmoc 到 S-Fm 的转化机理。S-Fm-Cysteine 二肽和三肽在与 N-(Pg-α-氨基酰基)苯并三唑和 N-(Pg-α-二肽酰基)苯并三唑偶联时很容易形成酰胺键,从而得到更大的肽。