title: Structures of the novel α-glucosyl linked diterpene glycosides from Stevia rebaudiana.
abstract: From the commercial extract of the leaves of Stevia rebaudiana, two new minor diterpene glycosides having α-glucosyl linkage were isolated besides the known steviol glycosides including stevioside, steviolbioside, rebaudiosides A-F, rubusoside and dulcoside A. The structures of the two compounds were identified as 13-[(2-O-(3-α-O-d-glucopyranosyl)-β-d-glucopyranosyl-3-O-β-d-glucopyranosyl-β-d-glucopyranosyl)oxy] ent-kaur-16-en-19-oic acid β-d-glucopyranosyl ester (1), and 13-[(2-O-β-d-glucopyranosyl-3-O-(4-O-α-d-glucopyranosyl)-β-d-glucopyranosyl-β-d-glucopyranosyl)oxy] ent-kaur-16-en-19-oic acid β-d-glucopyranosyl ester (2), on the basis of extensive NMR and MS spectral data as well as chemical studies.
authors.affiliation: The Coca-Cola Company, Organic Chemistry Department, Research and Technology, Atlanta, GA 30313, USA. vchaturvedula@na.ko.com
authors.forename: Venkata Sai Prakash
authors.initials: VS
authors.lastname: Chaturvedula
authors.forename: Mani
authors.initials: M
authors.lastname: Upreti
authors.forename: Indra
authors.initials: I
authors.lastname: Prakash
mesh_terms: D004224:Diterpenes / Q000737:chemistry*; D045786:Diterpenes, Kaurane / Q000737:chemistry; D005960:Glucosides / Q000737:chemistry; D006027:Glycosides / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D036625:Stevia / Q000737:chemistry*
chemical_list: D004224:Diterpenes; D045786:Diterpenes, Kaurane; D005960:Glucosides; D006027:Glycosides; C074471:steviolbioside; C012043:stevioside; C056177:rubusoside