Fern Constituents : Triterpenoids Isolated from Leaflets of Cyathea lepifera

Abstract

Four new minor triterpenoids, 9α, 11α-epoxyfernane (1), 9β, 11β-epoxyfernane (2), 3α, 10α-epoxyfilic-4(23)-ene (3) and 20α, 22-dihydroxyhopane (4) were isolated from fresh leaflets of Cyathea lepifera, together with known triterpenoids, fern-9(11)-ene (5), fern-7-ene (6), filic-3-ene (7), adiantone (8), glaucanone (9), fern-9(11)-en-12-one (10), hydroxyhopane (11), hopan-30-oic acid (12) and cycloartanoid esters (13). The structures of the new compounds were elucidated on the basis of spectral data.