Prenylated xanthones from Cudrania cochinchinensis

Cytotoxic Prenylated Xanthones from the Leaves of Garcinia bracteata

“…54S, Supporting Information). Compounds 7-23 were identified as allanxanthone A (7) [18], ananixanthone (8) [19], morusignin I (9) [20], gartanin (10) [21], 8-deoxygartanin (11) [22], 1,3,5-trihydroxy-6′,6′-dimethylpyrano(2′,3′: [22], brasixanthone B (14) [24], 3-hydroxyblancoxanthone (15) [25], xanthone V1 (16) [26], gerontoxanthone I (17) [27], assiguxanthone A (18) [28], 1,3,5-trihydroxy-13,13-dimethyl-2H-pyran [7,6-b]xanthen-9-one (19) [23], 1,3,5-trihydroxy-2prenylxanthone (20) [29], xanthone V1a (21) [26], latisxanthone D (22) [28], and norswetianin (23) [30] by comparison of their spectroscopic data with those reported in the literature.…”

Pharmacological studies on the crude drug ‘Hwang‐Jin‐Guey’ from Taiwan (1)

“…This result is surprising, and the possibility exists that several active components present in the aqueous extract are different to those of the ethanol extract. In previous papers (Chang et al, 1989a(Chang et al, , 1989b, we have reported several new prenylated xanthones (named gerontoxanthones A , B, C, D, E, G , H and I) together with the known xanthones (cudraxanthone A, curdraniaxanthone and osajaxanthone) isolated from the root bark of C. cochinchinensis.…”

Three New Caged Prenylxanthones from Garcinia bracteata

“…As a part of our search for secondary metabolites from tropical plants, a careful investigation of the twigs of G. bracteata led to the isolation of three new caged prenylxanthones, neobractatin (1), 3-O-methylneobractatin (2), and 3-Omethylbractatin (3), together with five known caged prenylxanthones, bractatin (4) [9], isobractatin (5) [9], 1-O-methylisobractatin (6) [9], neoisobractatin A (7) [10], neoisobractatin B (8) [10] (Fig. 1), and three known classical xanthones, gerontoxanthone I [16], morusignin I [17], and macluraxanthone [18]. The details of the isolation and structure elucidation of the new compounds, 1 -3, are reported in this article.…”