Seven iridoids are isolated from Borreria verticillata root barks: daphylloside 1, asperuloside 2, feretoside 3, methyl desacetylasperulosidate 4, desacetylasperuloside 5, asperulosidic acid 6 and desacetylasperulosidic acid 7. Their structures result from spectroscopic analysis and are proved by chemical correlation.
From stem bark of Randia formosa (Rubiaceae) four iridoids are isolated: 10-caffeoyl-deacetyldaphylloside (1), which is a new compound, and feretoside (2), gardenoside (3) and deacetylasperulosidic acid (4), which are already known.Une recherche systématique sur les plantes á iridoides de la flore guyanaise a été entreprise dans le cadre d'une collaboration entre le centre ORSTOM de Cayenne et ce Laboratoire (1). L'étude des écorces de tiges de Randia formosa Schum. (Rubiacées) fait l'objet de la présente publication.Le R. formosa est un arbrisseau inerme á rameaux rigides. Les feuilles, lancéolées, de 2 á 7 cm de long, sont pubescentes á la face inférieure. Les fleurs blanches, terminales, donnent naissance á une bate ovoide (2). Le lot d'écorces de tiges étudié á été récolté á Montjoly (Guyane). Un échantillon d'herbier (CM 1170) est déposé au centre ORSTOM (Cayenne).
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