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Two new dihydrobenzofuran lignans from Rabdosia lophanthoides (Buch.-Ham.ex D.Don) Hara
Wei-Sheng Feng1, Xin-Yu Zang, Xiao-Ke Zheng
1School of Pharmaceutical Science, Henan University of Traditional Chinese Medicine, Zhengzhou, China. fwsh@hactcm.edu.cn
Abstract:
Two new dihydrobenzofuran lignanosides, (7R,8S)-4,3',9'-trihydroxyl-3-methoxyl-7,8-dihydrobenzofuran-1'-propylneolignan-9-O-(6-O-syringoyl)-beta-D-glucopyranoside, named lophanthoside B (1) and (7R,8S)-4,9,9'-trihydroxyl-3-methoxyl-7,8-dihydrobenzofuran-1'-propylneolignan-3'-O-beta-D-glucopyranoside (2), an enantiomer of umbroside, along with four known dihydrobenzofuran lignans (3-6), were isolated from 50% acetone extract of Rabdosia lophanthoides (Buch.-Ham.ex D.Don) Hara. Their structures were elucidated by NMR and MS experiments.
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