Abstract
Sonchus erzincanicus (Compositae) is an endemic species for Turkey and six Sonchus species grow in Turkey [1]. Sonchus species are known as „sütlük, kuzu gevreği, eşek marulu“ in Turkey [2]. It has been found that some Sonchus species contain sesquiterpene lactone glucosides, flavonoids, triterpenes and steroids [3,4]. No phytochemical study has so far been carried out on S. erzincanicus. Phytochemical studies were performed on aerial parts of that plant. The isolation of the compounds was carried out using several and repeated chromatographic techniques from chloroform, ethyl acetate and aqueous phases that were partitioned from the methanol extract obtained from the plant. 3′,4′,5,7 tetrahydroxy 3-methoxy flavone and quercetin 3-O-β-D-glucoside were isolated from the ethyl acetate phase; luteolin 7-O-β-D-glucoside, luteolin 7-O-glucuronide, apigenin 7-O-glucuronide were isolated from aqueous phase. The structures of the compounds were elucidated by means of 1H-NMR, 13C-NMR and 2D-NMR (COSY, HMQC, HMBC).
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