Michio Takido

A flavonol glycoside from Lysimachia Mauritiana

Abstract From the whole plant of Lysimachia mauritiana, a new flavonol glycoside (mauritianin) was isolated together with hyperin, kaempferol-3-O-robinobioside and kaempferol-3-O-α-rhamnopyranosyl-(1–2)-β-galactopyranoside. The structure of mauritianin was established as kaempferol-3-O-(2,6-di-O-α-rhamnopyranosyl-β-galactopyranoside).

Two flavonol glycosides from Lysimachia fortunei

Abstract From the whole plant of Lysimachia fortunei, two new flavonol glycosides were isolated together with trifolin, hyperin, isorhamnetin 3-galactoside, rutin, quercetin 3-rhamnosyl (1 → 2)galactoside, isorhamnetin 3-robinobioside and mauritianin. The structures of the new compounds were established as quercetin 3-(2,6-dirhamnopyranosylgalactopyranoside) and isorhamnetin 3-(2,6-dirhamnopyranosylgalactopyranoside).

Phlegmacins and anhydrophlegmacinquinones: Dimeric hydroanthracenes from seedlings of Cassia torosa☆

Abstract From seedlings of Cassia torosa four dimeric hydroanthracenes have been isolated. Two, a pair of atropisomeric dimers consisting of two molecules o

Two flavonol glycosides from Lysimachia nummularia

Abstract From the whole plant of Lysimachia nummularia two new flavonol glycosides were isolated together with trifolin, isoquercitrin, myricitrin, mearnsitrin, syringetin 3-galactoside, kaempferol 3- O -rhamnosyl (1 → 2) galactoside, quercetin 3- O -neohesperidioside, rutin, kaempferol 3- O -(2,6-dirhamnosylgalactoside) and quercetin 3- O -(2,6-dirhamnosylgalactoside). The structures of the new compounds were established as myricetin 3- O -arabinofuranoside and syringetin 3- O -xylopyranoside.

Dimeric hydroanthracenes from the unripe seeds of Cassia torosa

Abstract From the unripe seeds of Cassia torosa three new dimeric hydroanthracene derivatives were isolated along with stigmasterol, sitosterol, campesterol, physcion-9-anthrone, torosachyrsone and the phlegmacins A 2 and B 2 . The structures of the new derivatives were established as physcion-10, 10′-bianthrone, anhydrophlegmacin B 2 [2-(6′-methoxy-3′-methyl-3′, 8′, 9′-trihydroxy-1′-oxo-1′, 2′, 3′, 4′-tetrahydroanthracene-10′-yl)-1, 8-dihydroxy-3-methoxy-6-methyl-9-oxo-9, 10-dihydroanthracene] and torosanin [2-(6′-methoxy-3′-methyl-3′, 8′,9′-trihydroxy-1′-oxo-1′, 2′, 3′,4′-tetrahydroanthracene-5′-yl)-1, 8-dihydroxy-3-methoxy-6-methyl-9-oxo-9, 10-dihydroanthracene], respectively.

Phlebotrichin, a phenolic compound from the fresh leaves of Viburnum phlebotrichum

Abstract Arbutin and a new phenolic glucoside were isolated from the fresh leaves of Viburnum phlebotrichum . The structure of the new compound named phlebotrichin was established as 1- O -(4-hydroxyphenyl)-6- O -[(2 E , 6 S )-2,6-dimethyl-6-hydroxy-2,7-octadienoyl]-β- D -glucopyranoside.

Quercetin 3-rhamnosyl (1 → 2) galactoside from Lysimachia vulgaris var. davurica

Abstract From the whole plant of Lysimachia vulgaris var. davurica, a new flavonol glycoside was isolated together with astragalin, hyperin, isorhamnetin 3-galactoside, syringetin 3-galactoside and isorhamnetin 3-robinobioside. The structure of the new compound was established as quercetin 3-rhamnosyl (1 → 2) galactoside.

Studies on the constituents of the seeds of Cassia obtusifolia: The structures of two new lactones, isotoralactone and cassialactone

Abstract Torosachrysone and two new naphthalenic lactones, isotoralactone and cassialactone, were isolated from the seeds of Cassia obtusifolia. Their structures were established as 9,10-dihydroxy-7-methoxy-3-methylene-1H-naphtho(2,3-c)dihydropyrone-1-one and 8-methoxy-4-methyl-1-oxo-4,10,11-trihydroxy-naphtho(2,3-c)oxepin, respectively.

Composition of unsaponifiable lipid from seed oils ofPanax ginseng andP. quiquefolium

The composition of the unsaponifiable lipid, which consisted of squalene, squalene-2,3-oxide, triterpene alcohols, 4α-methyl-sterols, and sterols, of the seed oils ofPanax ginseng andP. quiquefolium, was determined. Squalene was the most abundant component (54%) of the unsaponifiable lipid fromP. ginseng, whereas sterols constituted the principal components of unsaponifiable lipid fromP. quiquefolium. Both ginseng seed oils showed specific features in sterol composition, i.e., 28-isofucosterol (40%) and 24-ethyl-22E-dehydrocholesterol (66%) constituted the most predominant components of the sterol fractions fromP. ginseng andP. quiquefolium seed oils, respectively.

Germitorosone and methylgermitorosone, two hydroanthracene derivatives from seedlings of Cassia torosa

Abstract Two new yellow pigments, germitosone and methylgermitorosone, were isolated from the seedling of Cassia torosa . The structures of these substances were established as 3,7 dimethyl - 6 - methoxy - 1 - oxo - 2,3,8,9 - tetrahydroxy - 1,2,3,4 - tetrahydroanthracene and 6,9 dimethoxy - 3,7 - dimethyl - 1 - oxo - 2,3,8 - trihydroxy - 1,2,3,4 - tetrahydroanthracene respectively.