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Structure of ent-15-hydroxy-kaur-16-en-19-oic acid

Author(s): Julia Bruno-Colmenarez | Graciela Díaz De Delgado | Alexis Peña | Libia Alarcon | Alfredo Usubillaga | Paulino Delgado-Méndez

Journal: Avances en Química
ISSN 1856-5301

Volume: 6;
Issue: 2;
Start page: 16;
Date: 2011;
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Keywords: natural products | ent-kaurene diterpenes | crystal structure

Ent-15α-hydroxy-kaur-16-en-19-oic acid, C20H30O3, isolated from the leaves of Coespeletia moritziana, is reported in this work. This compound crystallizes in the monoclinic system, space group C2 and unit cell parameters a=19.7509 (5), b=10.5126 (3), c=8.8020 (3) Å, β=93.722(2)° and V= 1823.73(9) Å3. The structure consists of three six-membered rings, labeled A, B, and C and a five-membered ring, called ring D. Additionally, this compound shows 7 chiral atoms whose configuration, obtained by anomalous dispersion, is represented by R-C4, S-C5, R-C8, S-C9, S-C10, R-C13 and R-C15.
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