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Compound 1 from Gymnema sylvestre

Reference work entry

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Taxonomy: Physicochemical and Pharmacological Properties of Triterpene Glycosides – Glycosides of Aglycones of Oleanene Type – 21β-O-Benzoyl-sitakisogenin

Biological source: Gymnema sylvestre [1]

C49H72O16: 916.482

Mp: 226–228°C [1]

[α]D20 + 15.4° (c 0.16, MeOH) [1]

IR (KBr) νmax cm−1: 3422, 2948, 1702, 1636, 1460, 1388, 1282, 1160, 1076, 1026 [1]

FAB-MS (positive ion mode) m/z: 917 (M + H)+ [1]

1H NMR (500 MHz, J/Hz, C5D5N): 0.84 (s, CH3-25), 0.97 (s, CH3-24), 0.98 (s, CH3-26), 1.01 (s, CH3-30), 1.30 (s, CH3-23), 1.32 (s, CH3-29), 1.37 (s, CH3-27), 3.17 (dd, J = 4.5, 13.3, Hα-3), 3.37 (d, J = 10.0, Ha-28), 4.40 (d, J = 10.0, Hb-28), 4.66 (m, Hα-16), 5.37 (brs, H-12), 5.70 (dd, J = 4.6, 12.2, Hα-21), 7.49 (overlapped, H-3′, -4′, and -5′), 8.26 (dd, J = 1.3, 7.2, H-2′ and -6′)

β-D-GlcUAp: 4.84 (d, J = 7.2, H-1), 4.05 (H-2), 4.26 (H-3), 4.27 (H-4), 4.46 (H-5)

β-D-Glcp: 5.25 (d, J = 7.2, H-1), 4.01 (H-2), 4.21 (H-3), 4.10 (H-4), 4.05 (H-5), 4.27 (H-6), 4.57 (dd, J...

References

  1. 1.
    W. Ye, X. Liu, Q. Zhang, Ch. Tao Che, S. Zhao, J. Nat. Prod 64(2), 232 (2001)CrossRefGoogle Scholar

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© Springer Science+Business Media New York 2013

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