title: Diterpene constituents of leaves from Juniperus brevifolia.
abstract: The dichloromethane extract from leaves of Juniperus brevifolia, through chromatographic fractionations yield six compounds: 3beta-hydroxy-abieta-8,11,13-trien-7-one, 18-hydroxy-sandaracopimara-8(14),15-dien-7-one, sandaracopimara-8(14),15-dien-18-yl formate; and the first examples of sandaracopimaranes and abieta-8,11,13-triene diterpenoids with a large aliphatic chain on C-18, abieta-8,11,13-trien-18-yl hexadecanoate, 7-oxoabieta-8,11,13-trien-18-yl hexadecanoate, sandaracopimara-8(14),15-dien-18-yl hexadecanoate. Moreover fifteen known compounds were also isolated, some of them for the first time identified on Juniperus genus. The compound abieta-8,11,13-trien-18-yl formate is reported for the first time as a natural product. All the structures were established by spectroscopic methods. 2D NMR techniques have allowed the revision of certain previously reported (13)C NMR assignments. Studies on the isolated new compounds showed those possessing a diterpenol ester of a long-chain fatty acid present lipophilicity very distinct from other diterpenoid compounds.
authors.affiliation: Department of Technologic Sciences and Development, University of Azores, Rua Mãe de Deus, 9501-801 Ponta Delgada, Azores, Portugal.
authors.forename: Ana M L
authors.initials: AM
authors.lastname: Seca
authors.forename: Artur M S
authors.initials: AM
authors.lastname: Silva
authors.forename: Isabel L
authors.initials: IL
authors.lastname: Bazzocchi
authors.forename: Ignacio A
authors.initials: IA
authors.lastname: Jimenez
mesh_terms: D004224:Diterpenes / Q000737:chemistry* / Q000302:isolation & purification; D018653:Juniperus / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D018515:Plant Leaves / Q000737:chemistry
chemical_list: D004224:Diterpenes