Biomimetic Total Synthesis and Antimicrobial Evaluation of Anachelin H
作者:Karl Gademann、Yann Bethuel、Hans H. Locher、Christian Hubschwerlen
DOI:10.1021/jo701402b
日期:2007.10.1
biomimetic totalsynthesis of the iron chelator anachelin H isolated from the cyanobacterium Anabaena cylindrica is reported. A first generation approach delivered one enantiomeric series of the polyketide fragment. Comparison of the 1H NMR data suggested the relative configuration of this anachelin fragment. The relative and absolute configuration of anachelin H was then established by totalsynthesis. A
[structure: see text] The first total synthesis of anachelin H is reported. Starting from L-Ser, a stereodivergent synthesis of the polyketide fragment resulting in all possible diastereoisomers is described. The alkaloidpeptide fragment is prepared via a tellurium-mediated oxidative aza annulation as the key step. Coupling of the fragments gave synthetic anachelin H, which was found to be identical to a sample