STUDIES ON THE CHEMICAL CONSTITUENTS OF PSEUDOTSUGA SINENSIS

AIMTo study the chemical constituents of Pseudotsuga sinensis Dode (Pinaceae). METHODS To separate the constituents of P.sinensis by using various kinds of chromatography and identify their structures on the basis of spectral analysis. RESULTSSix compounds were isolated from P. sinensis. Their structures were established as 5,7,4′-trihydroxy-6-methylflavanone (poriol, I), 3,5,7,3′,4′-pentahydroxyflavonone (quercetin, II), 5,7,3′,5′-tetrahydroxy-6-methylflavanone (III), 5,7,3′,5′-tetrahydroxyflavanone (IV), 3,5,7,3′,5′-pentahydroxyflavanone (V) and 5-hydroxy-6-methylchromone-7-O-β-D-glucopyranoside (VI) based on the analysis of spectral data of IR, UV, MS, 1D and 2D-NMR. CONCLUSIONCompounds III and VI are new compounds. All of six compounds were isolated from this plant for the first time.