title: Complete 1H and 13C NMR assignments of six saponins from Sapindus trifoliatus.
abstract: Complete 1H and 13C spectral assignments are reported for six saponins from the pericarp of Sapindus trifoliatus (Hindi name: Reetha) collected from Madhya Pradesh and Maharashtra, India, using only 1D and 2D NMR methods. The structures of the compounds were elucidated as hederagenin 3-O-(3-O-acetyl-beta-D-xylopyranosyl)-(1-3)-alpha-L-rhamnopyranosyl-(1-2)-alpha-L-ara-binopyranoside, hederagenin 3-O-(4-O-acetyl-beta-D-xylop-yranosyl)-(1-3)-alpha-L-rhamnopyranosyl-(1-2)-alpha-L-arabinop-yranoside, hederagenin 3-O-(3,4-O-diacetyl-beta-D-xylopy-ranosyl)-(1-3)-alpha-L-rhamnopyranosyl-(1-2)-alpha-L-arabinopy-ranoside, hederagenin 3-O-(3,4-O-diacetyl-alpha-L-arabinop-yranosyl)-(1-3)-alpha-L-rhamnopyranosyl-(1-2)-alpha-L-arabinop-yranoside, hederagenin 3-O-(beta-D-xylopyranosyl)-(1-3)-alpha-L-rhamnopyranosyl-(1-2)-alpha-L-arabinopyranoside and he-deragenin 3-O-(alpha-L-arabinopyranosyl)-(1-3)-alpha-L-rhamno-pyranosyl-(1-2)-alpha-L-arabinopyranoside. It is concluded that saponins of this complexity approach the limit of structural complexity, which can be solved by NMR alone, precisely and quickly.
authors.affiliation: NMR Laboratory, Division of SAIF, Central Drug Research Institute, Lucknow, India.
authors.forename: Rajesh K
authors.initials: RK
authors.lastname: Grover
authors.forename: Abhijeet D
authors.initials: AD
authors.lastname: Roy
authors.forename: Raja
authors.initials: R
authors.lastname: Roy
authors.forename: S K
authors.initials: SK
authors.lastname: Joshi
authors.forename: Vandita
authors.initials: V
authors.lastname: Srivastava
authors.forename: Sudershan K
authors.initials: SK
authors.lastname: Arora
mesh_terms: D002247:Carbon Isotopes; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D011522:Protons; D032127:Sapindus / Q000737:chemistry*; D012503:Saponins / Q000737:chemistry*
chemical_list: D002247:Carbon Isotopes; D011522:Protons; D012503:Saponins