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- Title
Hydrogenation of the Exocyclic Olefinic Bond at C-16/C-17 Position of ent-Kaurane Diterpene Glycosides of Stevia rebaudiana Using Various Catalysts.
- Authors
Prakash Chaturvedula, Venkata Sai; Prakash, Indra
- Abstract
Catalytic hydrogenation of the exocyclic double bond present between C16 and C17 carbons of the four ent-kaurane diterpene glycosides namely rebaudioside A, rebaudioside B, rebaudioside C, and rebaudioside D isolated from Stevia rebaudiana has been carried out using Pt/C, Pd(OH)2, Rh/C, Raney Ni, PtO2, and 5% Pd/BaCO3 to their corresponding dihydro derivatives with 17a and 17ß methyl group isomers. Reactions were performed using the above-mentioned catalysts with the solvents methanol, water, and ethanol/water (8:2) under various conditions. Synthesis of reduced steviol glycosides was performed using straightforward chemistry and their structures were characterized on the basis of 1D and 2D NMR spectral data, including a comparison with reported spectral data.
- Subjects
HYDROGENATION; ALKENES; ENT-Kauranes; DITERPENES; GLYCOSIDES; STEVIA rebaudiana; CARBON; CHEMICAL bonds
- Publication
International Journal of Molecular Sciences, 2013, Vol 14, Issue 8, p15669
- ISSN
1661-6596
- Publication type
Article
- DOI
10.3390/ijms140815669