3 years ago

Synthesis and Structural Revision of the Fungal Tetramic Acid Metabolite Spiroscytalin

Synthesis and Structural Revision of the Fungal Tetramic Acid Metabolite Spiroscytalin
Oxana Kempf, Karl Kempf, Ursula Bilitewski, Rainer Schobert, Manuel Orozco
Spiroscytalin, a natural 3-spirotetramic acid of hitherto uncertain absolute configuration, was synthesized for the first time by a one-pot Knoevenagel–IMDA reaction of an l-phenylalanine-derived tetramic acid and (R)-2-methyl-deca-6E,8E-dienal. Its absolute configuration was assigned by the known configurations of the starting compounds and by NOESY correlations. Its identity with the natural isolate was proved by the comparison of the NMR and circular dichroism spectra and of the specific optical rotations. Its absolute configuration (3R,5S,6S,7R,11S,14R) is enantiomeric to that originally proposed by the isolating group. This natural isomer of spiroscytalin showed moderate activity against Candida albicans and good activity against an export-deficient mutant of Escherichia coli.

Publisher URL: http://dx.doi.org/10.1021/acs.joc.7b00727

DOI: 10.1021/acs.joc.7b00727

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.