期刊
CARBOHYDRATE RESEARCH
卷 340, 期 13, 页码 2086-2096出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carres.2005.06.024
关键词
ursolic acid; saponin; glycosylation; synthesis
The focus of this work was on the synthesis of two bidesmosidic ursolic acid saponins bearing a 2,3-branched trisaccharide residue. Therefore, 3-O-{[beta-D-glucopyranosyl-(1-->2)]-[alpha-L-arabinopyranosyl-(1-->3)]-alpha-L-arabinopyranosyl}ursolic acid-28-O-[beta-D-glucopyranosyl] ester 1 was concisely synthesized by two strategies in 22% and 41% overall yield, respectively, and another congener 3-O-{[beta-D-xylopyranosyl-(1-->2)]-[beta-D-glucopyranosyl-(1-->3)]-alpha-L-arabinopyranosyl}ursolic acid-28-O-[beta-D-glucopyranosyl] ester 2 was also efficiently prepared in 81% overall yield. The H-1 NMR and C-13 NMR signals of saponin 2 are all consistent with those reported for the natural product. (C) 2005 Elsevier Ltd. All rights reserved.
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