Hisae Fukumoto

Xanthones in cell suspension cultures of Hypericum paturum

Abstract A new xanthone named paxanthone, 9,11-dihydroxy-5-methoxy-3,3-dimethylpyrano[3,2-a]xanthen-12(3H)-one, has been isolated from the callus tissues of Hypericum paturum together with toxyloxanthone B and γ-mangostin. Their structures were elucidated using spectral techniques.

An isopentenylated flavonol from Hypericum japonicum

Abstract A new isopentenylated flavonol, salothranol, from whole plants of Hypericum japonicum was isolated together with the known isojacareubin. Its struc

A flavanonol rhamnoside from Hypericum japonicum

Abstract A new flavanonol (2R,3R)-taxifolin-7-rhamnoside, from whole plant of Hypericum japonicum has been isolated together with the known quercitrin and vincetoxicoside B. Their structures were elucidated using spectral techniques.

Antianaphylactic Effects of the Principal Compounds from the White Petals of Impatiens balsamina L.

Several flavonols and naphthoquinones have been isolated from a 35% ethanol extract (IB) of the white petals of Impatiens balsamina L. The antianaphylactic effects of the principal compounds were investigated using a murine immediately hypersensitivity reaction system induced by hen egg‐white lysozyme (HEL). The active extracts and phenolic compounds in IB were shown to inhibit significantly both the fatal anaphylactic shock and heterologous PCA reaction.

Co-occurrence of prenylated xanthones and their cyclization products in cell suspension cultures of Hypericum patulum

Abstract A new xanthone named paxanthone B, 5,9,11-trihydroxy-3,3-dimethyl-8-(3-methyl-2-butenyl)-3H,12H-pyrano[3,2-a]xanthen-12-one, has been isolated from callus tissues of Hypericum patulum, together with the known garcinone B and 1,3,6,7-tetrahydroxy-8-(3-methyl-2-butenyl)-9H-xanthen-9-one. Their structures were elucidated using spectral techniques.

A phloroglucinol derivative from cell suspension cultures of Hypericum patulum

A new phloroglucinol derivative named paglucinol, 3-[2,2-dimethyl-4-(1-methylvinyl) cyclopentyl]-2,4,6-trihydroxyphenyl phenyl ketone, has been isolated from cell suspension cultures of Hypericum patulum, together with the known compounds oleanolic acid and β-sitosterol. Their structures were elucidated by spectral techniques.

A dipeptide derivative fromHypericum japonicum

Abstract The structure of a novel peptide analogue saropeptate, N -benzoyl- l -phenylalanyl- l -phenylalaninol acetate, isolated from the whole plant of H. japonicum was elucidated by spectroscopic analysis and its absolute configuration determined by comparison with four synthetic diastereoisomers.

A 2-pyrone derivative from Hypericum japonicum

Abstract A new 2-pyrone derivative, named saropyrone, [2,3,3-trimethyl-6-(3′4′-dihydroxyphenyl)-2,3-dihydro-4-oxo-4 H-furo[3, 2- c ] pyran], has been isol

Structure determination of a kaempferol 3-rhamnosyldiglucoside from Impatiens balsamina.

Abstract The chemical structure of a kaempferol 3-rhamnosyldiglucoside, isolated from white petals of Impatiens balsamina was unambiguously determined to be kaempferol-3- O -[2″- O -α- l -rhamnopyranosyl-3″ O -β- d -glucopyrano-syl]-P-D-glucopyranoside based on the spectroscopic techniques.

A xanthone substituted with an irregular monoterpene in cell suspension cultures of Hypericum patulum

Abstract A new xanthone named paxanthonin, 1,2,6-trihydroxy-8-methoxy-2-(2′,2′-dimethyl-4′-isopropenyl)-cyclopentanyl-xanthone, has been isolated from the callus tissues of Hypericum patulum together with morusignin D. The structures of both compounds were elucidated by spectroscopic methods.