Two new diastereoisomeric saponins named as Julibroside J14 and Julibroside J15 were isolated from the dried stem barks of Albizia julibrissin. On the basis of chemical and spectral methods, their structures were elucidated as 3-O-[β-D-xylopyranosyl-(1→2)-β-D-arabinonosyl-(1→6)-β-D-glucopyranosyl]-21-O-{(6S)-2-trans-2,6-dimethyl-6-O-[4-O-((6R)-2-trans-2,6-dimethyl-6-O-β-D-quinovopyranosyl-2,7-octadienoyl)-β-D-quinovopyranosyl]-2,7-octadienoyl} acacic acid 28-O-β-D-glucopyranosyl-(1→3)-[α-L-arabinofuranosyl-(1→4)]-α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranosyl ester (1) and 3-O-[β-D-xylopyranosyl-(1→2)-β-D-arabinopyranosyl-(1→6)-β-D-glucopyranosyl]-21-O-{(6S)-2-trans-2,6-dimethyl-6-O-[4-O-((6S)-2-trans-2,6-dimethyl-6-O-β-D-quinovopyranosyl-2,7-octadienoyl)-β-D-quinovopyranosyl]-2,7-octadienoyl} acacic acid 28-O-β-D-glucopyranosyl-(1→3)-[α-L-arabinofuranosyl-(1→4)]-α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranosyl ester (2), respectively.
triterpenoid saponins, Albizia julibrissin, Leguminousae, diastereoisomerism, julibroside J14, julibroside J15
Journal NLM ID: 101279494WWW link: http://www.cjcu.jlu.edu.cn/EN/Y1999/V20/I12/1877Publisher: Changchun, China
Institutions: Department of Natural Medicines, Beijing Medical University, Beijing 100083, China
Methods: IR, FAB-MS, TLC, HPLC, UV, optical rotation measurement
Found