New diterpenes from Sideritis canariensis

Diterpenes from Sideritis sipylea and S. dichotoma

Gülaçtı TOPÇU*, Ahmet C. GÖREN *University of İstanbul, Faculty of Pharmacy, 34452, Beyazıt, İstanbul-TURKEY TÜBİTAK, Marmara Research Center, Department of Chemistry, P.O. Box 21, 41470, Gebze, Kocaeli-TURKEY Turgut KILIÇ, Y. Kemal YILDIZ Balıkesir University, Necatibey Education Faculty, Department of Chemistry, 10100 Balıkesir-TURKEY Gülendam TÜMEN Balıkesir University, Art and Science Facul...

new macrocyclic diterpenes from euphorbia connata

Two New Clerodane Diterpenes from Tinospora sagittata.

Two new clerodane-type diterpenes, tinosporins C (1) and tinosporins D (2) were isolated from the stems of Tinospora sagittata (Oliv.), together with three known ones, columbin (3), tinophylloloside (4), and tinospinoside D (5). The structures of these compounds were determined on the basis of spectroscopic data interpretation, with that of the absolute configuration of compound 1 was assigned ...

New rearranged clerodane diterpenes from Tinospora baenzigeri.

Baenzigeroside B, a new rearranged clerodane diterpene glucoside, was isolated from the stems of Tinospora baenzigeri. The aglycone of baenzigeroside B, baenzigeride B (isolated as its acetate), was found together with baenzigeride A, baenzigerosides A and B in the leaves of the same plant. Baenzigeride B and baenzigeroside B are the first examples of a new class of rearranged clerodane diterpe...

Five new labdane diterpenes from Aster oharai.

Five new labdane diterpenes (1-5) together with seven known diterpenes have been isolated from a methanol extract of the aerial parts of Aster oharai. Five new structures were determined as 7alpha-hydroperoxylabda-8(17),14-dien-13(R)-ol-4-O-acetyl-alpha-L-6-deoxyidopyranoside (1), 7alpha-hydroperoxylabda-8,14-dien-13(R)-ol-4-O-acetyl-alpha-L-6-deoxyidopyranoside (2), labda-7,14-dien-13(R)-ol-4-...