Efficient Synthesis of a Bisglycosyl Kaempferol from<i>Fagonia taeckholmiana</i>
作者:Qingchao Liu、Wenhong Li、Tiantian Guo、Dong Li、Zhen Fan、Suihong Yan
DOI:10.1246/cl.2011.324
日期:2011.3.5
The first total synthesis of kaempferol-3-O-β-l-arabinopyranosyl-(1→4)-α-l-rhamnopyranoside-7-O-α-l-rhamnopyranoside (1), a 3,7-triglycosylflavone, which was isolated from the aerial parts of Fagonia taeckholmiana, was accomplished in 13 steps and 9.2% overall yield from commercially available kaempferol. We efficiently employed phase-transfer-catalyzed (PTC) glycosylation for the construction of phenol glycosides. Applying this approach will allow the preparation of derivatives for further study of structure–activity relationships (SAR).