Structure and stereochemistry of a triterpenoid epoxide from Adiantum capillus-veneris

Molecular evolution of biomembranes: structural equivalents and phylogenetic precursors of sterols.

“…We have already mentioned several questions still open. It would also be possible and interesting (i) to investigate more systematically the distribution of hopanoids and of specific carotenoids among prokaryotes; (ii) to define the intracellular localization of hopanoids and of hydroxylated carotenoids in prokaryotic cells and their orientation in membranes; (iii) to investigate the behavior of hopanoids and of the various membrane "bracers" on different types of artificial membranes of phospholipids, in particular those containing branched chains; and (iv) to study the intracellular localization of hopanoids in the only eukaryotes found regularly to contain 3-deoxyhopanoids along with sterols-the ferns (36,37), together with a few bryophytes (38,39), lichens (40), and fungi (41,42). Are their hopanoids perhaps localized in some of their organelles, like chloroplasts or mitochondria?…”

Biogenetic-Type Rearrangements of Terpenes

“…A mixture of ß 9 (ll>.z 1 -hopadiene (415) and ß 12 • 21 -hopadiene (not shown) upon heating in the presence of activated fuller's earth gave rise to ß 7 • 9 (lll_fernadiene (416, 25%) which was reduced to ß 8 Like their counterparts, !1 5 -glutinene (383) and !1 3 -friedelene (384), in the previous section, adianene (410) (501,507), simiarenyl acetate (417) (506,510), simiarenone (510), and filicene (411) (507,511) undergo acidcatalyzed retro-biogenetic rearrangements. Although rearrangement all the way to !1 13 (lBl_neohopene (412) is possible under forcing conditions, a substantial amount of the relatively stable !1 8 -fernene (413), has also been isolated from this reaction.…”

“…Although rearrangement all the way to !1 13 (lBl_neohopene (412) is possible under forcing conditions, a substantial amount of the relatively stable !1 8 -fernene (413), has also been isolated from this reaction. The reaction of filicane-3tl,4tl-oxide (Cl-epoxide of 411) with boron trifluoride etherate in benzerre gives a mixture of !1 5 (lOl_adianen-3tl-oi and !1 8 -fernene-3tl-OH) (511 (411) …”

Anti-inflammatory and anti-nociceptive activities of ethanolic extract and its various fractions from Adiantum capillus veneris Linn.

“…Chemical analysis of A. capillus veneris Linn. reveals an array of compounds including triterpenes, flavonoids, phenylpropanoids and carotenoids (Berti et al, 1969;Takahisa et al, 1999). Khare (1996) and Vasudeva (1999) have described the use of Adiantum species for the treatment of various diseases.…”