title: Two new phragmalin-type limonoids from Chukrasia tabularis var. velutina.
abstract: Two new phragmalin-type limonoids with different structural skeletons, chuktabrin K (1) and tabulalin J (2), were isolated from the stem barks of Chukrasia tabularis var. velutina in the course of our ongoing research work in this area. Compound 1 was a 16-norphragmalin with an enolic alkyl appendage at C-15, and the carbonate moiety in 1 was also rare in natural organic molecules. The basic skeleton of compound 2 was a D-ring-opened phragmalin. Their structures were elucidated on HR-ESI-MS, ¹H and ¹³C-NMR, HSQC, HMBC, and ROESY experiments.
authors.affiliation: Testing & Analysis Center, Nanjing Normal University, Nanjing 210023, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Li
authors.forename: Jun
authors.initials: J
authors.lastname: Luo
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.forename: Ling-Yi
authors.initials: LY
authors.lastname: Kong
mesh_terms: D004365:Drugs, Chinese Herbal / Q000737:chemistry; D036701:Limonins / Q000737:chemistry* / Q000302:isolation & purification*; D009682:Magnetic Resonance Spectroscopy; D029582:Meliaceae / Q000737:chemistry*; D015394:Molecular Structure; D024301:Plant Bark / Q000737:chemistry; D018547:Plant Stems / Q000737:chemistry
chemical_list: D004365:Drugs, Chinese Herbal; D036701:Limonins