Gymnemaside III

Reference work entry

CAS Registry Number: 141358-46-5 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

C47H78O17: 914.523

Mp: 182–184°C [1]

[α]D + 8.2° (c 6.0, MeOH) [1]

IR (KBr) νmax cm−1 : 3400, 1700, 1630 [1]

FAB-MSm/z: 937 [M + Na]+ [1]

1H NMR (400 MHz, J/Hz, C5D5N): 0.91, 0.98, 1.03, 1.29, 1.48, 1.68, 1.69 (s, CH3 × 7), 3.37 (dd, J = 11.5, 4.0, H-3), 5.30 (m, H-24), 10.31 (s, CHO-19), 4.95 (d, J = 6.0, H-1 of Ara), 5.05 (d, J = 7.5, H-1 of Glc′), 5.17 (d, J = 8.0, H-1 of Glc′) [1]

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

Table 1

C-1

33.5

C-11

22.5

C-21

21.7

Ara-1

104.8

Glc′-1

98.6

2

27.6

12

25.5

22

40.1

2

81.3

2

75.6

3

87.6

13

42.3

23

23.3

3

73.5

3′

79.1

4

40.1

14

50.5

24

126.1

4

68.4

4

72.0

5

54.9

15

31.9

25

130.8

5

65.2

5

77.8

6

17.7

16

27.9

26

25.8

Glc-1

106.1

6

63.2

7

34.7

17

48.4

27

17.9

2

76.5

   

8

40.4

18

15.9

28

26.7

3

78.2

   

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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