- Sonchus erzincanicus (Asteraceae) is an endemic species in Turkey, where six Sonchus
species grow. In this study, a phytochemical study was performed on the aerial parts of the plant.
The study describes the isolation and structure elucidation of five flavonoids and two α-ionone
glycosides from S. erzincanicus. The compounds were isolated using several and repeated
chromatographic techniques from ethyl acetate and aqueous phases that were partitioned from a
methanol extract obtained from the plant. 5,7,3',4'-Tetrahydroxy-3-methoxyflavone (1) and
quercetin 3-O-β-D-glucoside (2) were isolated from the ethyl acetate phase, while corchoionoside
C 6’-O-sulfate (3), corchoionoside C (4), luteolin 7-O-glucuronide (5) and luteolin 7-O-β-Dglucoside
(6), apigenin 7-O-glucuronide (7) were isolated from the aqueous phase. Corchoionoside
C 6’-O-sulfate (3), isolated for the first time from a natural source, was a new compound. The
structures of the compounds were elucidated by means of 1H-NMR, 13C-NMR, 2D-NMR (COSY,
HMQC, HMBC) and ESI-MS.
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