Phytochemistry p. 2251 - 2256 (1984)
Update date:2022-08-25
Topics:
Ramaiah, Parimi Atchuta
Devi, Parimi Uma
Frolow, Felix
Lavie, David
3-Oxo-friedelan-20α-oic acid, named as maytenonic (polpunonic) acid, has been isolated along with β-amyrin and sitosterol from Gymnosporia emarginata. 1H and 13C NMR signals have been assigned for the structure.X-ray analysis of the single crystal confirmed that the carboxylic acid is α-oriented at C-20 and the D/E rings of this D:A-friedo-oleanane are in chair-chair conformation. 13C NMR data of the present compound also enabled the assignment of the C-20α- and β-methyl carbons in friedelin. - Key Word Index: Gymnosporia emarginata; Celastraceae; β-amyrin; D:A-friedo-oleananes; friedelin; 3-oxo-friedelan-20α-oic acid; maytenonic acid; polpunonic acid; sitosterol.
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