<i>N</i>,<i>O</i>-Isopropylidenated Threonines as Tools for Peptide Cyclization: Application to the Synthesis of Mahafacyclin B
作者:Nima Sayyadi、Danielle Skropeta、Katrina A. Jolliffe
DOI:10.1021/ol0522891
日期:2005.11.1
The influence of a single N,O-isopropylidenated threonine turn-inducer on the cyclization of a linear heptapeptide precursor to mahafacyclin B has been investigated. Incorporation of an N,O-isopropylidenated threonine more than doubles the head-to-tail cyclization yield. The N,O-isopropylidene grouping is then readily disassembled to give the antimalarial cyclic peptide in high yield.