Euclein: A new binaphthaquinone from Euclea pseudebenus

7-MethyljugIone, 8,8′-dihydroxy-4,4′-dimethoxy-6,6′-dimethyl-2,2′-binaphthyl-1,1′-quinone, 2-methylnaphthazarin, mamegakinone and euclein have been isolated from Euclea pseudebenus. Euclein is the 3,6′-dimer of 7-methyljuglone.     

Eucleolatin: A dimeric methylnaphthazarin from Euclea lanceolata

8,8′-Dihydroxy-4,4′-dimethoxy-6,6′-dimethyl-2,2′-binaphthyl-1,1′-quinone, 7-methyljuglone, 8′-hydroxydiospyrin, and eucleolatin have been isolated from the root bark of E. lanceolata. Eucleolatin is the 3,6′or 3,7′- dimer of 2-methylnaphthazarin.     

Naphthoquinone dimers and trimers from Euclea natalensis

The naphthoquinone dimers natalenone, 8′-hydroxydiospyrin and euclanone and the trimers galpinone and a compound with MW 562 were isolated from E. natalensis roots. Natalenone is a dehydrodimer of 7-methyl- juglone with the two moieties linked by two CC bonds to give a fused tetracyclic structure, one ring bearing a methylene bridge. Galpinone is a 7-methyljuglone linear trimer, the three units probably being linked C-8-C-6′and C-3′-C-3″. Euclanone is a new dimer of 7-methyljuglone and methylnaphthazarin, isomeric with 8′-hydroxydiospyrin.     

Naphthoquinones and triterpenes from african Diospyros species

Investigation of the bark and/or wood of seventeen African species of Diospyros has revealed the presence of a number of triterpenes and naphthoquinones. The triterpenes lupeol, betulin and betulinic acid were detected in all samples but three other triterpenes were each found in only one species; betulinaldehyde in D. canaliculata, cerin in D. iturensis, and glutinol in D. zenkeri. Naphthoquinones were detected in fourteen of the seventeen species and the common dimeric compounds diospyrin, isodiospyrin and diosindigo-A were isolated. D. canaliculata differed from all other species in producing derivatives of plumbagin including its reduced form, isoshinanolone (1R,2R) and a novel stereoisomer which was given the trivial name epiisoshinanolone (1S,2R).     

Naphthoquinones and triterpenes from some asian Diospyros species

Investigation of the stem bark, wood and/or fruit of nine Asian Diospyros spp. (Ebenaceae) has revealed a range of triterpenes and naphthoquinones     

Naphthoquinones produced by Fusarium oxysporum isolated from citrus

Six naphthoquinone pigments are described which were produced by Fusarium oxysporum isolates obtained from roots of diseased citrus trees. These were 8-O-methylbostrycoidin, 9-O-methylfusarubin, 9-O-methylanhydro-fusarubin, 5-O-methyljavanicin, 5-O-methylsolaniol and 1,4-naphthalenedione-3,8-dihydroxy-5,7-dimethoxy-2-(2-oxopropyl). These naphthoquinones had not been previously identified from F. oxysporum isolates.     

Naphthoquinones produced by Fusarium solani isolated from citrus

Eleven naphthoquinone pigments are described which were produced by F. solani isolates obtained from roots of diseased citrus trees. One of these pigments was shown to be the precursor for six of the isolated compounds.     

New naphthoquinones from Diospyros

7-Methyljuglone (I), isodiospyrin (II), the 2,2′-binaphthyl-1,1′-quinone (III), and a new quinone (IV), hydroxyisodiospyrin, were isolated from the     

Isoflavones from Dipteryx odorata

Five isoflavones have been isolated from the heartwood of Dipteryx odorata: retusin, retusin 8-methyl ether, 3′-hydroxyretusin 8-methyl ether, odoratin (7,3′-dihydroxy-6,4′-dimethoxyisoflavone) and dipteryxin (7,8-dihydroxy-6,4′-dimethoxyisoflavone).     

Isoflavones from Xanthocercis zambesiaca

In addition to the previously described 7-hydroxy-8,4′-dimethoxy- and 7,3′-dihydroxy-8,4′-dimethoxy-isoflavone the heartwood of Xanthocercis zambesiaca has been shown to contain 7-hydroxy-8,3′,4′-trimethoxy-,3′,4′-dimethoxy-6,7-methylenedioxy- and 8,3′,4′-trimethoxy-6,7-methylenedioxy-isoflavone. A technique of determining isoflavone hydroxylation patterns by deuterium labelling is described.     

New 8-hydroxyflavonoids from Solanum section Androceras

Five new 8-hydroxyflavonoids have been identified from leaves of Solanum section Androceras: 8-methoxymyricetin 3,7,4′-trimethyl ether; 8-hydroxymyricetin 3,7,4′-trimethyl ether; 8-hydroxymyricetin 8-O-glucosylxyloside 3,7,4′-trimethyl ether; 8-hydroxychrysoeriol 7-methyl ether; 8-hydroxychrysoeriol 7-O-glucoside.     

Isoflavonoids from Phaseolus coccineus

After treatment with CuCl₂, the following isoflavonoids have been isolated from the runner bean, Phaseolus coccineus: daidzein, genistein, isoprunetin, 2′-hydroxygenistein, phaseoluteone, 2′-hydroxydihydrodaidzein, isoferreirin, kievitone, cyclokievitone, glycinol, phaseollidin, phaseollin, demethylvestitol, phaseollinisoflavan, 2′-hydroxyisoprunetin and 7,4′-dihydroxy-5,2′-dimethoxyisoflavanone. The latter two compounds are novel natural products.     

Methoxyspheroidene and methoxyspheroidenone,two carotenoids from Rhodopseudomonas spheroides

Two new carotenoids isolated from Rhodopseudomonas spheroides (Rhodospirillaceae) have been identified as methoxyspheroidene (1,1′-dimethoxy-3,4-didehydro-1,2,1′,2′,7$\text{,}\text{?}$8′-hexahydro-ψ,ψ-carotene) obtained from anaerobic cultures and methoxyspheroidenone (1,1′-dimethoxy-3,4-didehydro-1,2,1′,2′,7′,8′-hexahydro-ψ,ψ-caroten-2-one) recovered from aerobic cultures.     

Nonadecan-7-ol-2-one an aliphatic ketol from Diospyros peregrina

A new aliphatic ketol isolated from the stems of Diospyros peregrina was characterized as nonadecan-7-ol-2-one by analyses MW determination chemical degradation and spectroscopic data.     

Three isoflavonoids from Iris germanica

From the rhizome of Iris germanica one new hexaoxygenated isoflavone, two new polyoxygenated isoflavone glucosides, the known isoflavonoids irisolidone, irigenin and iridin and acetovanillone, sitosterol, α-amyrin and β-amyrin were isolated. The structures of the new compounds were established by chemical and spectroscopic means and by correlation with known constitutents.     

Two methylated flavones from Artemisia frigida

Two new highly oxygenated flavones were isolated from Artemisia frigida. Their structures were determined by spectroscopic methods as 5,7,4′-trihydroxy-6,3′,5′-trimethoxyflavone and 5,7,3′-trihydroxy-6,4′,5′-trimethoxyflavone.     

Three methylated flavones from Thymus vulgaris

Three highly oxygenated flavones were isolated from leaves of Thymus vulgaris. Their structures were determined by spectroscopic methods as 5, 6, 4′-trihydroxy- 7, 8, 3′-trimethoxyflavone (thymonin), 5, 4′-dihydroxy-6, 7, 3′-trimethoxyflavone (cirsilineol) and 5, 4′-dihydroxy-6, 7, 8, 3′-tetramethoxyflavone. These flavones are reported for the first time in the genus Thymus.