Total Synthesis of Branimycin: An Evolutionary Approach
作者:Valentin S. Enev、Wolfgang Felzmann、Alexey Gromov、Stefan Marchart、Johann Mulzer
DOI:10.1002/chem.201200257
日期:2012.7.27
The first totalsynthesis of the macrolactone antibioticbranimycin (4) has been described. The key disconnection leads to a cis‐dehydrodecalone core and a polyketide side chain which are connected via organometallic addition. The dehydrodecalone core was targeted via altogether five different approaches featuring various kinds of chiral elements and ring‐closing methodology. In the end the most successful
The C13−C18 fragment 3 of the novel antibioticbranimycin was prepared along two highly stereocontrolled routes. The first one uses a standard Roush crotylation protocol, whereas the second one proceeds via an allenyl silane propargylation with unexpected stereochemical consequences, which are discussed in detail.