title: Sesquiterpenes from Blumea balsamifera.
abstract: Five new guaiane sesquiterpenes, blumeaenes E1 (1), E2 (2), K (3), L (4), and M (5), and one new eudesmane sesquiterpene, samboginone (6), along with three known compounds, cryptomeridiol, 3,3',5,7-tetrahydroxy-4'-methoxyflavanone, and austroinulin, were isolated from the leaves of the Philippine medicinal herb sambong, Blumea balsamifera. The absolute configuration of the new guaiane core was determined as 1S,7S,9S,10R by employing the modified Mosher's method. In the structure of 1, the absolute configuration of the epoxyangelic acid moiety was identified as 2S,3S using (R)-PGME as a chiral anisotropic auxiliary.
authors.affiliation: Division of Pharmacognosy and Phytochemistry, National Institute of Health Sciences, 1-18-1 Kamiyoga, Setagaya, Tokyo 158-8501, Japan. shirota@kph.bunri-u.ac.jp
authors.forename: Osamu
authors.initials: O
authors.lastname: Shirota
authors.forename: Jennifer M
authors.initials: JM
authors.lastname: Oribello
authors.forename: Setsuko
authors.initials: S
authors.lastname: Sekita
authors.forename: Motoyoshi
authors.initials: M
authors.lastname: Satake
mesh_terms: D019659:Asteraceae / Q000737:chemistry*; D015394:Molecular Structure; D019906:Nuclear Magnetic Resonance, Biomolecular; D010679:Philippines; D018515:Plant Leaves / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D045787:Sesquiterpenes, Eudesmane / Q000737:chemistry / Q000302:isolation & purification*; D045789:Sesquiterpenes, Guaiane / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D045787:Sesquiterpenes, Eudesmane; D045789:Sesquiterpenes, Guaiane; C558354:samboginone