Amino Acid Derived Enamides: Synthesis and Aminopeptidase Activity
作者:Richard R. Cesati、Greg Dwyer、Reinaldo C. Jones、Megan P. Hayes、Padmaja Yalamanchili、David S. Casebier
DOI:10.1021/ol7025729
日期:2007.12.1
Recently developed copper-catalyzed coupling methodology has been applied to the Synthesis of amino acid derived enamides. Bond formation proved to be strongly influenced by protection strategy and vinyl iodide substitution while tolerant of limited side chain functionality. Assessment of aminopeptidase activity revealed a preference for (E)-1,2-disubstituted constructs.
Solubilisierende Schutzgruppen f�r enzymatische Peptidsynthesen Untersuchungen mit Polyoxyethylen-gebundenen Substraten
A general procedure for the preparation of (carbamoylmethylene)amino pseudopeptides from the corresponding (cyanomethylenene)amino analogues, compatible with peptide bonds and with the usual amino and carboxyl protecting groups, is described. This procedure involves the oxidative hydration of (cyanomethylene)amino pseudopeptides with basic hydrogen peroxide under phase-transfer conditions, using n-tetrabutylammonium hydrogen sulfate as catalyst. In the basic medium of this reaction the methyl esters of (carbamoylmethylene) amino pseudodipeptides cyclized to 2,6-dioxopiperazine analogues.