title: Two new 7-dehydroaporphine alkaloids and antiplatelet action aporphines from the leaves of Annona purpurea.
abstract: Bioactivity-directed fractionation led to the isolation of two new 7-dehydroaporphine alkaloids, 7-hydroxy-dehydrothalicsimidine (1) and 7-formyl-dehydrothalicsimidine (2), along with the five known alkaloids, thalicsimidine (3), norpurpureine (4), N-methyllaurotetanine (5), lirinidine (6) and N-methylasimilobine (7), from the leaves of Annona purpurea. Structural elucidation of these compounds was established by mass and spectroscopic analyses. Among them, 1, 3, 4, 6 and 7 exhibited significant inhibition of collagen, arachidonic acid and platelet activating factor-induced platelet aggregation; 1 also showed inhibition against thrombin-induced platelet aggregation.
authors.affiliation: Graduate Institute of Natural Products, Kaohsiung Medical College, Taiwan.
authors.forename: F R
authors.initials: FR
authors.lastname: Chang
authors.forename: J L
authors.initials: JL
authors.lastname: Wei
authors.forename: C M
authors.initials: CM
authors.lastname: Teng
authors.forename: Y C
authors.initials: YC
authors.lastname: Wu
mesh_terms: D000470:Alkaloids / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D001060:Aporphines / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D055598:Chemical Phenomena; D002627:Chemistry, Physical; D006801:Humans; D018515:Plant Leaves / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D010972:Platelet Activating Factor / Q000494:pharmacology; D010974:Platelet Aggregation / Q000187:drug effects; D010975:Platelet Aggregation Inhibitors / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D013053:Spectrophotometry; D014197:Trees
chemical_list: C117117:7-formyl-dehydrothalicsimidine; C117116:7-hydroxy-dehydrothalicsimidine; D000470:Alkaloids; D001060:Aporphines; D010972:Platelet Activating Factor; D010975:Platelet Aggregation Inhibitors