Compound 3 from Gymnema sylvestre

Reference work entry

Open image in new window

Taxonomy: Physicochemical and Pharmacological Properties of Triterpene Glycosides – Glycosides of Aglycones of Oleanene Type – 29-Hydroxy-longispinogenin

Biological source: Gymnema sylvestre [1]

C42H67O14K: 834.416

Mp: 290–293°C [1]

[α]D20 + 10.3° (c 0.12, MeOH) [1]

IR (KBr) νmax cm−1: 3442, 2928, 1618, 1430, 1028 [1]

HR-ESI-MSm/z: 851 [(M + K) + H]+ [1]

1H NMR (400 MHz, J/Hz, C5D5N): 0.80 (s, CH3-25), 0.96 (s, CH3-24), 0.98 (s, CH3-26), 1.01 (s, CH3-30), 1.24 (s, CH3-23), 1.46 (s, CH3-27), 3.28 (m, H-3), 3.73 (d, J = 10.4, Ha-28), 4.45 (d, J = 10.4, Hb-28), 4.01 (d, J = 7.6, Ha-29), 4.06 (d, J = 7.6, Hb-29),4.79 (m, H-16), 5.30 (brs, H-12)

β-D-GlcUAp: 4.80 (d, J = 7.2, H-1), 4.02 (H-2), 4.27 (H-3), 4.26 (H-4), 4.40 (H-5)

β-D-Glcp: 5.24 (d, J = 7.2, H-1), 4.01 (H-2), 4.20 (H-3), 4.06 (H-4), 4.01 (H-5), 4.28 (H-6), 4.56 (dd, J = 10.4, 4.0, H-6) [1]

13 C NMR (125 MHz, C 5D 5N): [ 1]

Table 1

C-1

39.0

C-16

67.1

GlcUA-1

106.2

2

26.7

17

41.7

2

74.5

3

89.2

18

44.0

3

87.5

4

References

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

Copyright information

© Springer Science+Business Media New York 2013

Personalised recommendations