A Desymmetrization Approach toward Highly Oxygenated cis-Decalins
摘要:
The cis-decalin core 2 of the antibiotic branimycin has been prepared by desymmetrization of diepoxynaphthalene 4. The key steps involve two successive S(N)' opening of the oxa-bridges. An improved procedure for the synthesis of 4 is also described.
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