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Gymnemaside II

Reference work entry

CAS Registry Number: 141358-45-4 Open image in new window

Taxonomy: Physicochemical and Pharmacological Properties of Triterpene Glycosides – Glycosides of Aglycones of Dammarane Type – 19-Oxo-dammar-24-en-3β,20(S)-diol

Biological source: Gymnema sylvestre [1]

C48H80O18: 944.534

Mp: 212–214°C [1]

[α]D + 10.5° (c 3.2, MeOH) [1]

IR (KBr) νmax cm−1: 3400, 1700, 1635 [1]

FAB-MSm/z: 967 [M + Na]+ [1]

1H NMR (400 MHz, J/Hz, C5D5N): 0.91, 0.99, 1.03, 1.32, 1.48, 1.68, 1.68 (s, CH3 × 7), 3.37 (dd, J = 11.5, 4.0, H-3), 5.30 (m, H-24), 10.30 (s,CHO-19), 4.91 (d, J = 6.0, H-1 of Glc), 5.05 (d, J = 7.5, H-1 of Glc′), 5.17 (d, J = 8.0, H-1 of Glc″)

13 C NMR (100 MHz, C 5D 5N): [ 1]

Table 1

C-1

33.5

C-11

22.5

C-21

21.7

Glc-1

104.9

Clc′-1

98.6

2

27.6

12

25.5

22

40.1

2

83.6

2

75.6

3

87.6

13

42.3

23

23.3

3

78.2

3

79.1

4

40.1

14

50.5

24

126.1

4

72.0

4

71.7

5

54.9

15

31.9

25

130.8

5

78.3

5

77.8

6

17.7

16

27.9

26

25.8

6

62.8

6

63.2

7

34.7

17

48.4

27

17.9

Glc′-1

106.2

   

8

40.4

18

15.9

28

26.7

2

77.1

   

9

52.8...

References

  1. 1.
    K. Yoshikawa, S. Arihara, K. Matsuura, T. Miyase, Phytochemistry 31(1), 237 (1992)CrossRefGoogle Scholar

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© Springer Science+Business Media New York 2013

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