Sueo Hisada

Phenolic compounds from Forsythia leaves

Abstract Four lignans, four lignan glucosides, one flavonoid and two caffeoyl glycosides of 3,4-dihydroxyphenethyl alcohol were identified variously in leaves of Forsythia suspensa, F. viridissima and F. koreana . The leaf patterns were broadly similar to those reported earlier for the fruits, except that suspensaside and β-hydroxyacteoside were not detected.

Application of fast atom bombardment mass spectrometry to chlorogenic acids

Abstract The technique of positive- and negative-ion fast atom bombardment mass spectrometry has been shown to be capable of producing molecular mass and useful fragmentation information for the structural elucidation of chlorogenic acids. The mass spectra of chlorogenic acid and the related compounds 3′- O -methylchlorogenic acid, neochlorogenic acid, 4,5-dicaffeoyl quinic acid and 1,5-dicaffeoyl quinic acid are compared with those obtained by electron impact mass spectrometry.

Flavonoids from Rhamnus pallasii

Abstract A new dihydroflavonol, pallasiin, together with kaempferol, quercetin, isorhamnetin, mearnsetin, aromadendrin, eriodictyol and taxifolin, has been isolated from the bark of Rhamnus pallasii and its structure elucidated as 2,3-dihydromyricetin 4′- O -methyl ether.

Coumarins from Olea africana and Olea capensis

Abstract Esculetin and scopoletin were isolated from the bark of Olea africana while isoscopoletin and scoparone were isolated from the bark of Olea capensis . The distribution of these coumarins in Olea species from South Africa is described.

The ether-soluble lignans of Trachelospermum asiaticum var. intermedium

Abstract Matairesinol (I), arctigenin (II), trachelogenin (III) and a new lignan, nortrachelogenin (IV), have been isolated from stems of Trachelospermum asiaticum var. intermedium. The structure of IV has been proposed.

Lignan glycosides of trachelospermum asiaticum var. intermedium

Abstract Matairesinol-4′-β- d -glucoside (matairesinoside) and tracheloside have been isolated from the stem of Trachelospermum asiaticum var. intermedium . The structure of tracheloside is discussed.

Phenolic glucosides from Olea europaea subs. africana

Abstract Two new lignan glucosides, (+)-1-acetoxypinoresinol 4″-methyl ether 4′-β- d -glucoside and (+)-1-hydroxypinoresinol 4′-β- d -glucoside, together with three known glucosides, (+)-1-acetoxypinoresinol 4′-β- d -glucoside, esculin and oleuropein, were isolated from the bark of Olea europaea subs africana .

Isolation of glucosyringic acid from anodendron affine

Abstract Glucosyringic acid (4-β- d -glucopyranosyloxy-3,5-dimethoxybenzoic acid) has been isolated from Anodendron affine Durce. Its structure has been confirmed by synthesis.

The cyclitols of Ochrosia nakaiana, Plumeria acutifolia and Strophanthus gratus

Abstract l -(+)-Bornesitol was isolated from the leaves of Ochrosia nakaiana and Plumeria acutifolia , respectively. Dambonitol was isolated from the leaves of Strophanthus gratus .

A phloroglucinol derivative of Dryopteris abbreviata

Abstract A new phloroglucinol derivative, abbreviatin BB, has been isolated from Dryopteris abbreviata. Its structure was elucidated to be methylene-bis-met