title: A pregnane glycoside from the roots of Mandevilla pentlandiana.
abstract: A pregnane triglycoside containing a new genin 3 beta,14 beta-dihydroxy-21-methoxy-5 beta-pregnan-20-one has been isolated from the dried roots of Mandevilla pentlandiana. Chemical and spectroscopic evidence for the glycoside are consistent with the structure 3 beta, 14 beta-dihydroxy-21-methoxy-5 beta-pregnan-20-one-3-O-beta-D- diginopyranosyl-(1----4)-O-beta-D-cymaropyranosyl-(1----4)-O -beta-D-cymaropyranoside. It is noteworthy that 3 beta,14 beta,21-trihydroxy 5 beta-pregnan-20-one, biosynthetically related to the genin of this glycoside, has been proved to be a precursor of cardenolides, also produced by this plant.
authors.affiliation: Departamento de Química Orgánica, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina.
authors.forename: G
authors.initials: G
authors.lastname: Cabrera
authors.forename: A M
authors.initials: AM
authors.lastname: Seldes
authors.forename: E G
authors.initials: EG
authors.lastname: Gros
mesh_terms: D002240:Carbohydrate Sequence; D006027:Glycosides / Q000737:chemistry / Q000302:isolation & purification*; D009682:Magnetic Resonance Spectroscopy; D008969:Molecular Sequence Data; D015394:Molecular Structure; D010944:Plants / Q000737:chemistry*; D011278:Pregnanes / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D006027:Glycosides; D011278:Pregnanes