title: Spectral assignments of new diterpenes from Hyptis martiusii Benth.
abstract: The structural characterization of two new abietanes and a new spiro-fused tricyclic diterpene isolated from the roots of Hyptis martiusii is described. The first member of a new class of rearranged abietane diterpenoids designated martiusane was characterized by the use of 1D NMR and several 2D shift correlated NMR pulse sequences (1H,1H-COSY, HMQC, HMBC and NOESY). Unambiguous 1H and 13C chemical shift assignments for all compounds are reported.
authors.affiliation: Curso de Pós-Graduação em Química Orgânica, Departamento de Química Orgânica e Inorgânica, Centro de Ciências, Universidade Federal do Ceará, Cx. Postal 12 200, 60971-270 Fortaleza, CE, Brazil.
authors.forename: Edigênia Cavalcante
authors.initials: EC
authors.lastname: da Cruz Araújo
authors.forename: Mary Anne Sousa
authors.initials: MA
authors.lastname: Lima
authors.forename: Edilberto Rocha
authors.initials: ER
authors.lastname: Silveira
mesh_terms: D045784:Abietanes / Q000737:chemistry* / Q000302:isolation & purification; D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000302:isolation & purification; D004224:Diterpenes / Q000737:chemistry* / Q000302:isolation & purification; D031331:Hyptis / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D018517:Plant Roots / Q000737:chemistry; D013237:Stereoisomerism
chemical_list: D045784:Abietanes; D000972:Antineoplastic Agents, Phytogenic; D004224:Diterpenes