title: Bisbenzopyrans and alkaloids from the roots of Stemona cochinchinensis.
abstract: Two new bisbenzopyrans, namely 3,3'-bis(3,4-dihydro-4-hydroxy-6,8-dimethoxy-2H-1-benzopyran) (1), and 8'-methoxy-3,3'-bis(3,4-dihydro-4-hydroxy-6-methoxy-2H-1-benzopyran) (2), together with known 3,3'-bis(3,4-dihydro-4-hydroxy-6-methoxy-2H-1-benzopyran) (3), as well as three known pyrido[1,2-alpha]azapine alkaloids, stemokerrin (4), oxystemokerrin (5) and oxystemokerrin-N-oxide (6), were isolated and identified from the roots of Stemona cochinchinensis. The structures of these compounds were elucidated by 1D- and 2D-NMR spectra and other spectroscopic studies.
authors.affiliation: Faculty of Chemistry, Department of Organic Chemistry, Hanoi National University of Education, Caugiay District, Hanoi, Vietnam.
authors.forename: Pham-Huu
authors.initials: PH
authors.lastname: Dien
authors.forename: Li-Gin
authors.initials: LG
authors.lastname: Lin
authors.forename: Chun-Ping
authors.initials: CP
authors.lastname: Tang
authors.forename: Chang-Qiang
authors.initials: CQ
authors.lastname: Ke
authors.forename: Yang
authors.initials: Y
authors.lastname: Ye
mesh_terms: D000470:Alkaloids / Q000737:chemistry*; D001578:Benzopyrans / Q000737:chemistry; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D010936:Plant Extracts / Q000737:chemistry; D018517:Plant Roots / Q000737:chemistry*; D041901:Stemonaceae / Q000737:chemistry*
chemical_list: C534121:3,3'-bis(3,4-dihydro-4-hydroxy-6,8-dimethoxy-2H-1-benzopyran); C534122:8'-methoxy-3,3'-bis(3,4-dihydro-4-hydroxy-6-methoxy-2H-1-benzopyran); D000470:Alkaloids; D001578:Benzopyrans; D010936:Plant Extracts