Fern Constituents : Adiantum cuneatum. III. Four New Triterpenoids, 4, 23-Bisnor-3, 4-secofilic-5(24)-en-3-al, 4, 23-Bisnor-3, 3-dimethoxy-3, 4-secofilic-5(24)-ene, 7β, 25-Epoxyfern-9(11)-en-8α-ol and 7α, 8α-Epoxyfernan-25-ol

Abstract

Four new triterpenoids, 4, 23-bisnor-3, 4-secofilic-5(24)-en-3-al(1), 4, 23-bisnor-3, 3-dimethoxy-3, 4-secofilic-5(24)-ene (2), 7β, 25-epoxyfern-9(11)-en-8α-ol (3) and 7α, 8α-epoxyfernan-25-ol (4) were isolated from the fresh leaves of Adiantum cuneatum, and their structures were elucidated by means of spectroscopic analysis.