Cayaponoside B2

Reference work entry

CAS Registry Number: 162857-59-2 Open image in new window

Taxonomy: Physicochemical and Pharmacological Properties of Triterpene Glycosides – Glycosides of Aglycones of Cucurbitane Type – 22-Hydroxy-23,24-dihydro-25-en-fevicordin A

Biological source: Cayaponia tayuya [1]

C35H52O11: 648.350

Mp: 175–178°C [1]

[α]D26 + 1.0° (c 1.00, MeOH) [1]

UV λmaxMeOH nm (log ε): 206 (4.48), 220 (shoulder, 4.12), 283 (3.33) [1]

FAB-MSm/z: 647 [M-H], 485[M-H-162], 385 [1]

HR-FAB-MSm/z: 671.3416 [M + Na]+ [1]

1H NMR (J/Hz): 6.65 (s, H-1), ca 2.65, 2.85 (m, H2-6), ca 1.95, 2.25 (m, H2-7), 2.15 (d, J = 7, H-8), 2.21, 2.62 (d, J = 14, H2-12), 1.59 (d, J = 14), 1.98 (m, H2-15), 4.57 (t, J = 8, H-16), 2.34 (d, J = 7, H-17), 1.00 (s, CH3-18), 1.30 (s, CH3-19), 1.19 (s, CH3-21), ca 3.32 (H-22), ca 2.05, 2.25 (m, H2-23), ca 1.48, 1.70 (H2-24), 4.69 (brs, H2-26), 1.71 (CH3-27), 2.09 (CH3-28), 0.99 (CH3-30)

β-D-Glcp: 4.57 (d, J = 7, H-1), 3.45–3.49 (H-2, 3, 4), 3.31 (m, H-5), 3.84 (dd, J = 4, 12, Ha-6), 3.95...

References

  1. 1.
    E. Himeno, T. Nagao, J. Honda, H. Okabe, N. Irino, T. Nakasumi, Chem. Pharm. Bull. 42(11), 2295 (1994)CrossRefGoogle Scholar

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