Triterpenoide. X. Über neue isomere Triterpenlactone (original) (raw)

1997, Acta Crystallographica Section C Crystal Structure Communications

The X-ray crystal structure analyses of three new triterpene lactones (C29H4206), namely 9/3-hydroxy-28methoxy-11,28-dioxo-1,2-dinor-10a, 18/3-olean-12-en-3,-10/3-olide, (3), and its 18c~-and 9a,18o~-isomers, (4) and (5) [9/3-hydroxy-28-methoxy-11,28-dioxo-1,2-dinor-10a, 18c~-olean-12-en-3,10/3-olide and 9a-hydroxy-28methoxy-11,28-dioxo-1,2-dinor-10a, 18a-olean-12-en-3,10/3-olide, respectively], are described. Compounds (3)-(5) were obtained by treatment of 3/3-hydroxy-1 li" Teil IX. Zaprutko (1995).