Glycosides from the bark of Machilus robusta
2013
Bu, Peng-Bin | Li, Yan-Ru | Jiang, Ming | Wang, Fang | Wang, Xiao-Liang | Lin, Sheng | Zhu, Cheng-Gen | Shi, Jian-Gong
Six new glycosidic constituents (1 – 6), together with 10 known analogs, have been isolated from the bark of Machilus robusta . Structures of the new compounds, including the absolute configurations, were determined by spectroscopic and chemical methods as (−)-nectandrin B-β- d -glucopyranoside (1), (−)-(7 R ,7′ R ,8 S ,8′ R)-4,4′-dihydroxy-3,3′-dimethoxy-7,7′-epoxylignan-4- O -β- d -glucopyranoside (2), (−)-(7 R ,7′ R ,8 S ,8′ R)-4,4′-dihydroxy-3,3′-dimethoxy-7,7′-epoxylignan-4′- O -β- d -glucopyranoside (3), (−)-(8 S ,8′ R)-4,4′-dihydroxy-3,3′,5′-trimethoxylignan-4′- O -β- d -glucopyranoside (4), (−)-(7 R ,8 R)-syringylglycerol-8- O -β- d -glucopyranoside (5), and (−)-3-hydroxy-2-methyl-4-pyrone-3- O -β- d -xylopyranosyl-(1 → 6)- O -β- d -glucopyranoside (6), respectively.
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