Three new taxoids from the seeds of Japanese yew, Taxus cuspidata

Five taxane diterpenoids were isolated from the seeds of the Japanese yew, Taxus cuspidata Sieb, et Zucc. The structures were established as 2 alpha, 7 beta, 13 alpha-triacetoxy-5 alpha-(3'-dimethylamino-3'-phenyl)-propionyloxy-2(3-->20)-aboe- taxa-9,10-dione (1) and 2 alpha, 7 beta, 9 alpha, 10 beta-tetraacetoxy-5 alpha-[(2R,3S),N,N-dimethyl-3-phenylisoseryloxy]-taxa-4(20),11-dien-13-one (2), 2 alpha, 9 alpha, 10 beta-triacetoxy-5 alpha-cinnamoxy-taxa-4(20),11-diene-13 alpha-ol (3), taxezopidine] (4), and taxuspine D (5) on the basis of 1D, 2D NMR, and MS spectral analysis. Compounds 1, 2, and 3 are new compounds.