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Ent-15α-(3-methoxy-3-methyl-butanoyl)-kaur-16-en-19-oic acid a new ent-kaurenic acid derivative isolated from Coespeletia moritziana (Sch. Bip. ex Wedd) Cuatrec. (Asteraceae)

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Author(s): Alexis Peña | Libia Alarcón | Alfredo Usubillaga

Journal: Avances en Química
ISSN 1856-5301

Volume: 3;
Issue: 3;
Start page: 95;
Date: 2008;
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ABSTRACT
The acid fraction of the resin obtained from the leaves of Coespeletia moritziana, a “frailejón” collected at Páramo of Piedras Blancas, Mérida State, Venezuela, yielded ent-kaurenic acid, ent-kaur-9(11)-dien-19-oic acid (grandiflorenic acid), ent-15α-hydroxy-kaur-16-en-19-oic acid (grandiflorolic acid), ent-15α-acetoxy-kaur-16-en-19-oic acid, ent-16α-hydroxy-kauranic acid, and ent-15α-(3-methoxy-3-methyl-butanoyl)-kaur-16-en-19-oic acid, a diterpene acid not reported in the literature whose structure was established by spectroscopic methods
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