Artigo
A pentacyclic triterpene from Maytenus imbricata: structure elucidation by X-ray crystallography
Autor
Pimenta Jr., Alécio Antonio
Silva, Sílvia Ribeiro de Souza e
Silva, Grácia Divina de Fátima
Barbosa, Luiz Cláudio de Almeida
Ellena, Javier
Doriguetto, Antonio Carlos
Institución
Resumen
A pentacyclic triterpene, 3β,30-dihydroxy-lup-20(29)-ene, was isolated from the powder extract of Maytenus imbricata. The structure and stereochemistry of the compound were established by spectroscopic techniques and unambiguously determined by single crystal X-ray crystallography. The crystal structure shows one molecule in the asymmetric unit. The crystal packing is stabilized by O–H···O intermolecular hydrogen bonds, which give rise to infinite helical chains along the c unit cell axis. The intra-molecular geometry was analyzed using MOGUL, a knowledge base of molecular geometry derived from the Cambridge Structural Database (CSD).