Abstract
Three new taxoids, taxuspines N ∼ P ( 1 ∼ 3), have been isolated from stems of the Japanese yew Taxus cuspidata Sieb. et Zucc. and the structures elucidated on the basis of spectroscopic data. Taxuspine N ( 1) is the first example of a taxane diterpene containing a 6/8/6-membered ring system with a 3- N, N-dimethylamino-3-phenylpropanoyl group (Winterstein's acid) at C-13 from yew trees. The absolute configuration of the 3- N, N-dimethylamino-3-phenylpropanoyl group in 1 and 3 was determined to be R by chiral HPLC analysis.
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