Die Plant Science Student Conference (PSSC) wird seit 20 Jahren im jährlichen Wechsel von Studierenden der beiden Leibniz-Institute IPK und IPB organisiert. Im Interview erläutern Christina Wäsch (IPK) und Carolin Apel (IPB),…
Über 600 Gäste kamen am 4. Juli ans IPB zur Langen Nacht, die Wissen schafft, um bei unserem Wissenschafts-Quiz-Parcours viel Neues zu erfahren und ihre Kenntnisse unter Beweis zu stellen. Unser Programm in diesem Jahr…
Lohmann, J. S.; von Nussbaum, M.; Brandt, W.; Mülbradt, J.; Steglich, W.; Spiteller, P.;Rosellin A and B, two red diketopiperazine alkaloids from the mushroom Mycena rosellaTetrahedron745113-5118(2018)DOI: 10.1016/j.tet.2018.06.049
Rosellin A and B, two red diketopiperazine alkaloids with unprecedented structures, have been isolated from the fruiting bodies of the mushroom Mycena rosella. The structures of the rosellins were mainly deduced from their 2D NMR and HRMS (ESI) spectra. Their absolute configuration was determined by comparison of the CD spectra of the rosellins with the corresponding CD spectra obtained by quantum chemical calculations. Root exposure to rosellin A led to bleaching of the leaves of Lepidium sativum plants.
Publikation
Wilhelm, H.; Wessjohann, L. A.;An efficient synthesis of the phytoestrogen 8-prenylnaringenin from xanthohumol by a novel demethylation processTetrahedron626961-6966(2006)DOI: 10.1016/j.tet.2006.04.060
8-Prenylnaringenin, a flavonoid, is the strongest known phytoestrogen (plant derived estrogen mimic) used in phytomedicinal applications. Starting from xanthohumol a byproduct of hops-extraction, 8-prenylnaringenin can be synthesized via isoxanthohumol. Of various demethylation procedures tested, the best yield (92%) is obtained by treatment with scandium trifluoromethanesulfonate and potassium iodide without any need of protection. The demethylation with AlBr3/collidine and of the TIPS protected isoxanthohumol provides good results too.