title: Briarellins J-P and polyanthellin A: new eunicellin-based diterpenes from the gorgonian coral Briareum polyanthes and their antimalarial activity.
abstract: A new chemical study of the hexane extract of the gorgonian Briareum polyanthes collected in Puerto Rico afforded 10 new diterpenes of the eunicellin class, briarellins 1-9 and polyanthellin A (10), along with the known diterpene briarellin D (11). The structures and relative stereochemistry of metabolites 1-10 were assigned on the basis of NMR studies, chemical methods, and comparisons to the spectral properties of 11. A reassessment of prior structural assignment for briarellin A and two known sclerophytin-type diterpenes, 13 and 14, is proposed. Antimalarial tests on 1-6 and 8-12 indicated that they were active against Plasmodium falciparum.
authors.affiliation: Department of Chemistry, University of Puerto Rico, P.O. Box 23346, San Juan, Puerto Rico 00931-3346, USA.
authors.forename: Claudia A
authors.initials: CA
authors.lastname: Ospina
authors.forename: Abimael D
authors.initials: AD
authors.lastname: Rodríguez
authors.forename: Eduardo
authors.initials: E
authors.lastname: Ortega-Barria
authors.forename: Todd L
authors.initials: TL
authors.lastname: Capson
mesh_terms: D000107:Acetylation; D000818:Animals; D037421:Anthozoa / Q000737:chemistry*; D000962:Antimalarials / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D004224:Diterpenes / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D010963:Plasmodium falciparum / Q000187:drug effects*; D011647:Puerto Rico; D013237:Stereoisomerism
chemical_list: D000962:Antimalarials; D004224:Diterpenes; C476739:polyanthellin A