title: Alkaloids from stems and leaves of Stemona japonica and their insecticidal activities.
abstract: Five new alkaloids, 6beta-hydroxystemofoline (1), 16-hydroxystemofoline (2), neostemofoline (3), protostemodiol (4), and 13-demethoxy-11(S*),12(R*)-dihydroprotostemonine (5), along with 10 known alkaloids, were isolated from stems and leaves of Stemona japonica. Their structures were elucidated by 1D and 2D NMR and other spectroscopic studies. The insecticidal activity of the agonist 16-hydroxystemofoline (2) and antagonist 13-demethoxy-11(S*),12(R*)-dihydroprotostemonine (5) was demonstrated by electrophysiological in vitro tests on the insect nicotinic acetylcholine receptor and by in vivo screenings against relevant agricultural insect pests.
authors.affiliation: State Key Laboratory of Drug Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, People's Republic of China.
authors.forename: Chun-Ping
authors.initials: CP
authors.lastname: Tang
authors.forename: Tong
authors.initials: T
authors.lastname: Chen
authors.forename: Robert
authors.initials: R
authors.lastname: Velten
authors.forename: Peter
authors.initials: P
authors.lastname: Jeschke
authors.forename: Ulrich
authors.initials: U
authors.lastname: Ebbinghaus-Kintscher
authors.forename: Sven
authors.initials: S
authors.lastname: Geibel
authors.forename: Yang
authors.initials: Y
authors.lastname: Ye
mesh_terms: D000470:Alkaloids / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D000818:Animals; D001042:Aphids / Q000187:drug effects*; D001937:Brassica / Q000187:drug effects; D004365:Drugs, Chinese Herbal / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D007306:Insecticides / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D015394:Molecular Structure; D018515:Plant Leaves / Q000737:chemistry; D018547:Plant Stems / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D018411:Spodoptera / Q000187:drug effects*; D041901:Stemonaceae / Q000737:chemistry*
chemical_list: D000470:Alkaloids; D004365:Drugs, Chinese Herbal; D007306:Insecticides