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Cayaponoside A4

Reference work entry

CAS Registry Number: 162857-57-0 Open image in new window

Taxonomy: Physicochemical and Pharmacological Properties of Triterpene Glycosides – Glycosides of Aglycones of Cucurbitane Type – 20(R),29-Nor-1,2,3,4,5,10-hexadehydro-22,25-epoxy-cucurbitacin

Biological source: Cayaponia tayuya [1]

C35H52O11: 648.350

Mp: 155–160°C [1]

[α]D26 + 17.7° (c 0.97, MeOH) [1]

UV λmaxMeOH nm (log ε): 206 (4.49), 220 (shoulder, 4.16), 282 (3.41) [1]

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

HR-FAB-MSm/z: 671.3410 [M + Na]+ [1]

1H NMR (J/Hz): 6.66 (s, H-1), ca 2.65, 2.80 (m, H2-6), ca 1.95, 2.25 (m, H2-7), 2.15 (d, J = 7, H-8), 2.62, 2.78 (d, J = 14, H2-12), 1.60 (d, J = 13), 2.05 (brdd, J = 9, 13, H2-15), 4.57 (brt, J = 7, H-16), 2.31 (d, J = 7, H-17), 0.96 (s, CH3-18), 1.30 (s, CH3-19), 1.21 (s, CH3-21), 4.05 (t, J = 7, H-22), 1.90 (s, H2-23), 1.70 (m, H2-24), 1.23 ( m, CH3-26), 1.23 (s, CH3-27), 2.09 (s, CH3-28), 1.01 (s, CH3-30)

β-D-Glcp: 4.57 (d, J = 7, H-1), 3.45–3.49 (H-2, 3, 4), 3.31 (m,...

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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