Total Synthesis of the Ramoplanin A2 and Ramoplanose Aglycon
作者:Wanlong Jiang、Jutta Wanner、Richard J. Lee、Pierre-Yves Bounaud、Dale L. Boger
DOI:10.1021/ja020237q
日期:2002.5.1
subunits composed of residues 3−9 (heptapeptide 15), pentadepsipeptide 26, and pentapeptide 34 (residues 10−14) were prepared, sequentially coupled, and cyclized to provide the 49-membered depsipeptide core of the aglycon. Key to the preparation of the pentadepsipeptide 26 incorporating the backbone ester was the asymmetric synthesis of an orthogonally protected l-threo-β-hydroxyasparagine and the development
Alanine Scan of [<scp>l</scp>-Dap<sup>2</sup>]Ramoplanin A2 Aglycon: Assessment of the Importance of Each Residue
作者:Joonwoo Nam、Dongwoo Shin、Yosup Rew、Dale L. Boger
DOI:10.1021/ja068573k
日期:2007.7.1
ramoplanin A2 aglycon, a potent antibiotic that inhibits bacterial cell wall biosynthesis, is detailed. As a consequence of both its increased stability (lactam vs lactone) and its "relative" ease of synthesis, the alanine scan was conducted on [Dap2]ramoplanin A2 aglycon, which possesses antimicrobial activity equal to or slightly more potent than that of ramoplanin A2 or itsaglycon. Thus, 14 key