Planta Med 2002; 68(5): 477-479
DOI: 10.1055/s-2002-32080
Letter
© Georg Thieme Verlag Stuttgart · New York

Taibaijaponicains C and D: Two New Diterpenoids from Isodon japonica

Bao Lin Li
  • 1School of Chemistry and Material Science, Shaanxi Normal University, Xi’an, Shaanxi 710062, China
Further Information

Publication History

July 23, 2001

November 9, 2001

Publication Date:
07 June 2002 (online)

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Abstract

Two new C-20-oxygenated ent-kaurene diterpenoids, taibaijaponicains C and D, together with five known compounds, were isolated from the ethanol extract of the leaves and branches of Isodon japonica (Burm. f.) Hara. The structures of new compounds were elucidated as 1α-aectoxy-7β,12β,15α-trihydroxy-16α-hydroxymethyl-7,20-epoxy-ent-kaurane and 1α-acetoxy-2β,3α,6β,7β,12β-pentahydroxy-7,20;19,20-diepoxy-ent-kaur-16-en-15-one, respectively, on the basis of detailed spectroscopic analysis.