New Kaurane Diterpenoids from Aster tongolensis

Abstract

The MeOH-Et2O (1: 1) extract of the aerial parts of Aster tongolensis gave one known (1) and three novel (2-4) kaurane diterpenoids. Structures were established by spectral analyses (ir, ms, H-1 and C-13 nmr) and chemical transformation. The taxonomic significance of kaurane diterpenes is discussed in brief.