ABSTRACT
Objective To study the chemical constituents of flavonoids in pine needles of Cedrus deodara.Methods Flavonoids were isolated and purified from ethyl acetate extract of pine needles by chromatography on silica gel and Sephadex LH-20.Their structures were identified on the basis of spectroscopic analysis and chemical evidence.Results Five flavonoids were isolated and purified.Their structures were identified as cedrusone A(1),myricetin(2),2R,3R-dihydromyricetin(3),quercctin(4),and 2R,3R-dihydroquercetin(5).Conclusion Compound 1 is a new compound.Compounds 2-5 are isolated from pine needles of this genus for the first time.
ABSTRACT
Objective: To study the chemical constituents of flavonoids in the pine needles of Cedrus deodara. Methods: Flavonoids were isolated and purified from ethyl acetate extract of the pine needles by chromatography on silica gel and Sephadex LH-20. Their structures were identified on the basis of spectroscopic analysis and chemical evidence. Results: Five flavonoids were isolated and identified as 3′,5′-dimethoxymyricetin-3-O-(6″-O-acetyl)- α-D-glucopyranoside (1), myricetin (2), 2R,3R-dihydromyricetin (3), quercetin (4), and 2R,3R-dihydroquercetin (5). Conclusion: Compound 1 is a new compound named as cedrusone A. Compounds 2-5 are isolated from the pine needles in the plants of Cedrus Trew for the first time.