Dimeric and trimeric hydrolyzable tannins from Quercus coccifera and Quercus suber.
Three new hydrolyzable tannins, cocciferins D(1) (1), D(2) (2), and T(1) (4), were isolated from the leaves of Quercus coccifera. Cocciferin D(2) (2) and two additional new tannins, cocciferins D(3) (3) and T(2) (5), were also obtained from the leaves of Quercus suber. Their oligomeric structures were elucidated on the basis of spectroscopic methods and chemical evidence. Compounds 2, 3, and 5 were rare oligomers possessing glucose cores with both open-chain and pyranose forms.
Ito
Hideyuki
H
Faculty of Pharmaceutical Sciences, Okayama University, Tsushima, Okayama, 700-8530, Japan.
Yamaguchi
Koji
K
Kim
Tae-Hoon
TH
Khennouf
Seddik
S
Gharzouli
Kamel
K
Yoshida
Takashi
T
D000462:Algeria; D002851:Chromatography, High Pressure Liquid; D005947:Glucose / Q000737:chemistry; D006868:Hydrolysis; D047348:Hydrolyzable Tannins; D008745:Methylation; D008968:Molecular Conformation; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D018515:Plant Leaves / Q000737:chemistry; D011714:Pyrans / Q000737:chemistry; D029963:Quercus / Q000737:chemistry*; D013634:Tannins / Q000737:chemistry* / Q000302:isolation & purification*
D047348:Hydrolyzable Tannins; D011714:Pyrans; D013634:Tannins; C455779:cocciferin D1; C455780:cocciferin D2; C455781:cocciferin T1; D005947:Glucose