Orasa Pancharoen

A triterpenoid saponin from Maesa ramentacea

The structure of a piscicidal triterpenoid saponin (saponin A) isolated from the leaves of Maesa ramentacea has been shown to be 3-O-[[(alpha-rhamnopyranosyl (1-->2)-alpha-L-rhamnopyranosyl(1-->2)-beta-D-galactopyranosyl (1-->3)]-[beta-D-glucopyranosyl(1-->2)]-beta-D-glucuronopyranosyl] barringtogenol C21, 22-O-diangeloate. Extensive use was made of homo- and heteronuclear 2D NMR techniques.

Cyclohexane oxide derivatives from Kaempferia angustifolia and Kaempferia species

Abstract (−)-(3S,4R,5S,7S)-5-Benzoyloxymethyl-6-oxadicyclo-[4,1,0]hept-1-ene-3,4-diol 3-benzoate [(−)-pipoxide] and the two (+)-zeylenol related substances, (−)-(1R,2S,3R,4S)-2-benzoyloxymethylcyclohex-5-ene-1,2,3,4-tetrol 1,4-dibenzoate, and (1R,2S,3R,4S)-2-hydroxymethylcyclohex-5-ene-1,2,3,4-tetrol 1,4-dibenzoate, together with 2′-hydroxy-4,4′,6′-trimethoxychalcone, were isolated from the rhizomes of Kaempferia angustifolia, in addition to crotepoxide, boesenboxide and (+)-zeylenol. The rhizomes of an unnamed Kaempferia species have also been found to contain the zeylenol derivatives.

Phenylbutanoids from Zingiber cassumunar

Abstract Five novel phenylbutanoids have been isolated from the rhizomes of Zingiber cassumunar . 3,4-Dimethoxybenzaldehyde 2,4,5-trimethoxy-benzaldehyde are also reported from the same source.

Triterpenoid glycosides from Schefflera lucantha.

Three new triterpenoid glycosides were isolated from the leaves of Schefflera lucantha Viguier. Based on the spectroscopic data, especially 2D NMR, the structures of glycosides have been established as 3-O-[alpha-L-rhamnopyranosyl (1-->2)-beta-D-glucopyranosyl (1-->2)-beta-D-glucuronopyranosyl] betulinic acid, 3-O-[alpha-L-rhamnopyranosyl (1-->2)-beta-D-xylopyranosyl (1-->2)-beta-D-glucuronopyranosyl]betulinic acid and 3-O-[alpha-L-rhamnopyranosyl(1-->2)-beta-D-glucopyranosyl (1-->2)-beta-D-glucuronopyranosyl]oleanolic acid.

Cyclohexane diepoxides from Kaempferia rotunda

Abstract Three new cyclohexane diepoxides (−)-(1 R ,2 R ,4 R ,5 S ,6 R ,7 R )-4-benzoyloxymethyl-3,8-dioxatricyclo[5.1.0.0 2,4 ] octane-5,6-diol 6-acetate, (+)-(1 R ,2 R ,4 R ,5 S ,6 R ,7 R )-4-benzoyloxymethyl-3,8-dioxatricyclo-[5.1.0.0 2,4 ]octane-5,6-diol 5-acetate and (−)-(1 R ,2 R ,4 R ,5 S ,6 R ,7 R )-4-benzoyloxymethyl-3,8-dioxatricyclo[5.1.0.0 2,4 ] octane-5,6-diol 6-benzoate together with crotepoxide and (−)-zeylenol, were isolated from the rhizomes of Kaempferia rotunda . Their structures were characterized on the basis of spectral analyses and chemical correlations.