Jacqueline Gleye

A 2-Quinolone alkaloid from Almeidea guyanensis

Abstract From Almeidea guyanensis , besides N -methylatanine, N -methylflindersine, N -methylkhaplofoline and 4-demethyl- N -methylatanine, a new 2-quinolone, almeine, has been isolated and its structure elucidated as 4-isopropenyl- N -methyl-3,4-dihydrofuro-2-quinolone.

Iridoid glucosides from Avicennia germinans

Abstract A new iridoid glucoside, namely 2′-caffeoyl mussaenosidic acid has been isolated from leaves of Avicennia germinans along with the known compounds 2′-cinnamoyl mussaenosidic acid and verbascoside. The structure of the new compound was established by spectroscopic methods.

Alkaloids and flavonoids of Melicope indica

Abstract The following substances were isolated from the leaves of Melicope indica : N -methylatanine dictamnine, evolitrine, meliternatin, melibentin and a new flavonoid which was shown to be 3,5,8-trimethoxy-6,7: 3′,4′-dimethylenedioxyflavone by its spectroscopic properties.

A degraded limonoid from Fagaropsis glabra

Abstract The structure and absolute configuration of fraxinellonone isolated from Fagaropsis glabra was established as 3α-(3′-furanyl)-3α,7-dimethyl-4,5-dihydro-1,6-isobenzofurandione, by NMR and CD comparison with fraxinellone. Complete carbon assignments for fraxinellone and isofraxinellone were achieved by 13 C- 1 H COSY experiments.

Alcaloïdes de l' Isopyrum thalictroïdes—bases quaternaires des feuilles—isolement et identification de quatre pseudoprotoberberines

Abstract Besides the known magnoflorine, four new protoberberines were isolated from leaves of Isopyrum thalictroides . Their structures were deduced from spectral data. The names pseudoberberine, pseudocoptisine, pseudocolumbamine and dehydropseudocheilanthifoline are proposed for them.

C-glycosylflavones from Galipea trifoliata

Abstract From the stem bark of Galipea trifoliata were identified swertisin, isoswertisin, 2″-O-xylosylisoswertisin, vicenin-2, schaftoside, isoschaftoside and two new compounds: 6,8 di-C-glucosylgenkwanin and 2‴-O-xylosyl-6,8-di-C-glucosylgenkwanin.

Galipein, a coumarin from Galipea trifoliata

Abstract In addition to phebalosin and ramosin, the air-dried stem and root barks of Galipea trifoliata contain a third previously unreported coumarin identified as 7-isopentenyloxy-8-( trans -1′,2′-epoxy-3′-methyl-3′-butenyl)coumarin.

Phenolic compounds from Vepris heterophylla

Abstract From the leaves of Vepris heterophlylla, trans-sinapic acid methyl ester, 2″-O-glucosylisovitexin, 2″-O-glucosylvitexin, isovitexin

Fagaropsine, a degraded limonoid glucoside from Fagaropsis glabra

Abstract Phytochemical studies of the alcoholic-soluble portion of Fagaropsis glabra have resulted in the isolation of fagaropsine, a degraded limonoid glycoside. Its absolute structure was elucidated as 1-O-β- d -glucopyranosyl-4α-(3′-furanyl)-7β-hydroxy-4aα,8α-dimethyl-4,4a,5,6,7,8-hexahydro-3-benzopyran-2-one on the basis of spectral data.

O-glycosyl-C-glycosylflavones from Galipea trifoliata

Abstract From the stem bark of Galipea trifoliata the glycoflavones 2″- O -xylosylswertisin, 2″- O -glucosylswertisin, 2″- O -glucosylisoswertisin and 2″- O -β- d -xylosyl-8- C -β- d -galactosylapigenin were identified.