M.-J. Jacquier

Alkaloids of Alstonia lanceolifera

Abstract Four new indole alkaloids, 10-methoxydeplancheine, 10,11-dimethoxy-1-methyl-deacetyl picraline benzoate, 10,11-dimethoxy-1-methyl-deacetyl picraline 3′,4′,5′-trimethoxybenzoate and 10,11-dimethoxy-1-methyl-deacetyl picraline were isolated from the leaves of Alstonia lanceolifera .

Alkaloids of Alstonia plumosa

Abstract Nineteen indole alkaloids have been isolated from the root and stem barks of Alstonia plumosa, from New Caledonia. Twelve of them were known compou

Alkaloids from roots of Strychnos potatorum

Twenty-four compounds have been isolated and identified in the root bark of Strychnos potatorum. They are: Harmane carboxamide, cantleyine, 18,19-dihydrousambarensine, polyneuridine, norharmane, akuammidine, nor-C-flurorocurarine, ochrolifuanine A, bisnordihydrotoxiferine, ochrolifuanine E, normacusine B, normavacurine, henningsamine, 11-methoxyhenningsamine, dihydrolongicaudatine, dihydrolongicaudatine Y, antirhine, (20R- and (20S-dihydroantirhine, 11-methoxy-12-hydroxydiaboline, diaboline, 11-methoxydiaboline, desacetylretuline and diaboline N-oxide. The alkaloids in italic are novel.

Janussines a and b from strychnos johnsonii : A cross point in the biogenesis of quasidimeric alkaloids

Abstract Two new quasidimeric alkaloids have been isolated from Strychnos johnsonii. According to the fashion they are looked at, they can be viewed as arising from akagerine or from cathenamine-type of alkaloids.

Purification of the Main Ginsenosides from a French Crop of Panax Quinquefolium L.

Abstract Active components of Panax quinquefolium L. roots (French growing) have been separated by centrifugal partition chromatography (CPC). Five pure ginsenosides, namely Rb1, Re, Rd, Gypenoside XVII, and Fl 1, have been isolated in one step, using a biphasic mixture of ethyl acetate / 1-butanol / water and gradient elution. Part of the effluent was monitored with an evaporative light scattering detector (ELSD), for direct control of the collected fractions, allowing an easy detection of these molecules with low or no absorbance in the UV. Isolated ginsenosides have been identified by comparison with standards and by H and 13C NMR studies.

Structure de la Pandoline : Nouveau type d'alcaloide indolique

Resume La structure de la pandoline : (+) hydroxy 20ψ ψ- vincadifformine, est confirmee au moyen de deux correlations chimiques avec la (+) catharanthine.