Cumyl Ester as the C-Terminal Protecting Group in the Enantioselective Alkylation of Glycine Benzophenone Imine
作者:Tomasz Respondek、Eric Cueny、Jeremy J. Kodanko
DOI:10.1021/ol202939g
日期:2012.1.6
Cumyl ester is an optimal C-terminal protecting group for glycine benzophenone imine in asymmetric alkylation reactions catalyzed by Cinchona chiral phase-transfer catalysts. High levels of enantioselectivity have been obtained (up to 94% ee) with this substrate, which provides an attractive alternative to the analogous tert-butyl ester. N-terminal imines and the C-terminal esters can be cleaved from
A Divergent Strategy for Attaching Polypyridyl Ligands to Peptides
作者:Nitinkumar D. Jabre、Tomasz Respondek、Selma A. Ulku、Nadiya Korostelova、Jeremy J. Kodanko
DOI:10.1021/jo9021953
日期:2010.2.5
A divergent method for incorporating polypyridyl ligands into peptides is reported. Three N-Fmoc unnatural aminoacids (1−3) that contain varying linkers between the α-carbon and a 2-(hydroxymethyl)pyridyl group were synthesized in enantioenriched form. These aminoacids were used as anchors for incorporating multidentateligands onto a peptide chain in a site-specific fashion. Multiple peptide−ligand