Three new sesquiterpenes, 1 beta,7 alpha(H)-cadinane-4 alpha,6 alpha,10 alpha-triol (1), 1 alpha,5 beta-guaiane-10 alpha-O-ethyl-4 beta,6 beta-diol (2), and 6 beta,7 beta(H)-cadinane-1 alpha,4 alpha, 10 alpha-triol ( 3), together with 25 known ones, were isolated from the rhizome of Acorus calamus L. Their chemical structures were established on the basis of interpretation of spectroscopic data and comparison with those of the related known compounds.

A novel cadinane sesquiterpene with a propan-2-ylidene, named (1R,4R,6S,10R)-1-hydroxy-7(11)-cadinen-5,8-dione (1), and a new sesquiterpene, named (2R,6R,7S,9S)-1(10),4-cadinadiene-2,9-diol (2), were isolated from the ethanol extract of the rhizome of Acorus calamus L. Their structures were elucidated on the basis of spectroscopic data including NMR spectroscopy and X-ray crystallography. The absolute configurations of compounds 1 and 2 were confirmed by comparison of their experimental optical rotations with those obtained from theoretical calculations at the B3LYP/6-311+G (d) level of theory.

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Terpenes U 0200Triterpenoids from Pyrethrum tatsienense. -Triterpenoids (I) and (II) are isolated from an alcoholic extract of the whole plant of Pyrethrum tatsienense together with 8 known components. -(YANG, A.-M.; LIU, X.; LU, R.-H.; SHI*, Y.-P.; Pharmazie 61 (2006) 1, 70-73; Lanzhou Inst. Chem. Phys., Chin. Acad. Sci., Lanzhou 730000, Gansu, Peop. Rep. China; Eng.) -M. Bohle 18-175