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The trisaccharide, 3,4-di-O-(a-L-rhamnopyranosyl)-D-galactose was synthesized using benzyl 2,6-di-O-benzyl-β-D-galactopyranoside as starting compound. Its acetobromo derivative was coupled with 4′,7-di-O-benzyl-kaempferol. The structure of the synthetic kaempferol trioside was characterised by different spectroscopic methods (UV, IR,  1 H,  13 C NMR and MS). Chromatographic and mass spectrometric comparison of the synthetic product with ascaside precluded their identity.

zeitschrift für naturforschung b

Synthesis of Kaempferol-3-0-(3″,4″ -di-O-a-L-rhamnopyranosy)-β-D-galactopyranoside and its Comparison with the Natural Ascaside Isolated from Astragalus caucasicus