title: Indole alkoloids from Nauclea officinalis with weak antimalarial activity.
abstract: Five indole alkaloids (naucleofficines A-E) were isolated from the stems (with bark) of Nauclea officinalis: (E)-2-(1-beta-d-glucopyranosyloxybut-2-en-2-yl)-3-(hydroxymethyl)-6,7-dihydro-indolo[2,3-a]quinolizin-4(12H)-one (1), (E)-1-propenyl-12-beta-d-glucopyranosyloxy-2,7,8-trihydro-indolo[2,3-a]pyran[3,4-g]quinolizin-4,5(13H)-dione (2), (E)-2-(1-hydroxybut-2-en-2-yl)-11-beta-d-glucopyranosyloxy-6,7-dihydro-indolo[2,3-a]quinolizin-4(12H)-one (3), (E)-1-propenyl-4-hydroxy-2,4a,7,8,13b,14,14a-hepthydro-(4alpha,4abeta,13balpha,14abeta)indolo[2,3-a]pyran[3,4-g]quinolizin-5(13H)-one (4) and 1-(1-hydroxyethyl)-10-hydroxy-7,8-dihydro-indolo[2,3-a]pirydine[3,4-g]quinolizin-5(13H)-one (10-hydroxyangustoline) (5), together with two known compounds, naucleidinal (6) and angustoline (7). All of the structures of the seven compounds above were elucidated by spectroscopic methods including use of 1D- and 2D-NMR spectroscopic analyses. Compounds 2 and 3 are rare examples of monoterpene indole alkaloids with a glucopyranosyloxy group attached to position C-12. In vitro activity screening of the above seven compounds showed weak to moderate inhibitory activity against Plasmodium falciparum.
authors.affiliation: School of Pharmacy, Shandong University, Jinan 250012, People's Republic of China.
authors.forename: Jingyong
authors.initials: J
authors.lastname: Sun
authors.forename: Hongxiang
authors.initials: H
authors.lastname: Lou
authors.forename: Shengjun
authors.initials: S
authors.lastname: Dai
authors.forename: Hui
authors.initials: H
authors.lastname: Xu
authors.forename: Feng
authors.initials: F
authors.lastname: Zhao
authors.forename: Ke
authors.initials: K
authors.lastname: Liu
mesh_terms: D000470:Alkaloids / Q000737:chemistry* / Q000494:pharmacology*; D000818:Animals; D000962:Antimalarials / Q000737:chemistry* / Q000494:pharmacology*; D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000494:pharmacology; D045744:Cell Line, Tumor; D006801:Humans; D015394:Molecular Structure; D010963:Plasmodium falciparum / Q000187:drug effects; D019666:Rubiaceae / Q000737:chemistry*
chemical_list: D000470:Alkaloids; D000962:Antimalarials; D000972:Antineoplastic Agents, Phytogenic