title: Cytotoxic styryl-lactones from the leaves and twigs of Polyalthia crassa.
abstract: Four new styryl-lactones, crassalactones A-D (1-4), were isolated from a cytotoxic ethyl acetate-soluble extract of the leaves and twigs of Polyalthia crassa, together with seven known compounds, (+)-3-acetylaltholactone, (+)-altholactone, aristolactam AII, cinnamic acid, (+)-goniofufurone, (+)-goniopypyrone, and (+)-howiinol A. Their structures were determined on the basis of spectroscopic methods. The absolute configuration of 1-3 was established by chemical conversions. Single-crystal X-ray analysis and the Mosher ester method were used to confirm the absolute stereochemistry of 4. Cytotoxic evaluation against several mammalian cancer cell lines was performed on all new isolates, aristolactam AII, and the modified (+)-tricinnamate derivative 11 obtained from 1.
authors.affiliation: Department of Chemistry and Department of Physiology, Faculty of Science, Mahidol University, Rama VI Road, Bangkok 10400, Thailand.
authors.forename: Patoomratana
authors.initials: P
authors.lastname: Tuchinda
authors.forename: Bamroong
authors.initials: B
authors.lastname: Munyoo
authors.forename: Manat
authors.initials: M
authors.lastname: Pohmakotr
authors.forename: Pongchan
authors.initials: P
authors.lastname: Thinapong
authors.forename: Samaisukh
authors.initials: S
authors.lastname: Sophasan
authors.forename: Thawatchai
authors.initials: T
authors.lastname: Santisuk
authors.forename: Vichai
authors.initials: V
authors.lastname: Reutrakul
mesh_terms: D000818:Animals; D000972:Antineoplastic Agents, Phytogenic / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D019086:Bridged Bicyclo Compounds, Heterocyclic / Q000737:chemistry / Q000302:isolation & purification* / Q000494:pharmacology*; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D007783:Lactones / 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*; D031044:Polyalthia / Q000737:chemistry*; D051381:Rats; D013785:Thailand
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D019086:Bridged Bicyclo Compounds, Heterocyclic; D007783:Lactones; C000599655:crassalactone B