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New aurone epoxide and auronolignan from the heartwood of Cotinus coggygria Scop

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journal contribution
posted on 2018-12-04, 23:00 authored by Miroslav Novakovic, Iris Djordjevic, Nina Todorovic, Snezana Trifunovic, Boban Andjelkovic, Boris Mandic, Milka Jadranin, Ivan Vuckovic, Vlatka Vajs, Slobodan Milosavljevic, Vele Tesevic

New aurone epoxide, 2,10-oxy-10-methoxysulfuretin (14), and new auronolignan (15), named cotinignan A, were isolated by silica gel column and semipreparative HPLC chromatography from the methylene chloride/methanol extract of Cotinus coggygria Scop. heartwood. In addition, thirteen known secondary metabolites namely sulfuretin, 2,3-trans-fustin, fisetin, butin, butein, taxifolin, eriodictyol, 3',5,5',7–tetrahydroxyflavanone, 3',4',7-trihydroxyflavone, 3-O-methyl-2,3-trans-fustin, 3-O-galloyl-2,3-trans-fustin, β-resorcylic acid and 3-O-β-sitosterol glucoside were isolated as well. Their structures were elucidated by 1D and 2D NMR, HR-ESI-MS, IR and UV. Ten out of eleven isolated flavonoids possess 7, 3' and 4' hydroxy groups. These structural features could be considered as chemotaxonomic characteristic of flavonoids from C. coggygria. Cotinignan A (15) represents new subclass of secondary metabolites - auronolignans.

Funding

The authors acknowledge their gratitude to the Ministry of Science and Technological Development of Serbia for financial support, Project No. 172053.

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