An efficient method for the preparation of peptide alcohols
作者:Alan Roy Katritzky、Nader Elmaghwry Abo-Dya、Srinivasa Rao Tala、Kapil Gyanda、Zakaria Kamel Abdel-Samii
DOI:10.1039/b905730g
日期:——
N
-Protected LL-dipeptide alcohols 3a–p, diastereomeric mixture (3d + 3d′) and tripeptide alcohols 6a–c were synthesized by treatment of various amino alcohols with N-protected(α-aminoacyl)benzotriazoles 1a–c, 1f–m, (1a + 1a′) and N-protected(α-dipeptidoyl)benzotriazoles 5a, 5b respectively in good yields with complete retention of chirality.
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.