Stereoselective synthesis of flavonoids. Part 7. Poly-oxygenated β-hydroxydihydrochalcone derivatives
作者:Reinier J.J. Nel、Hendrik van Rensburg、Pieter S. van Heerden、Johan Coetzee、Daneel Ferreira
DOI:10.1016/s0040-4020(99)00554-2
日期:1999.8
Epoxidation of a series of poly-oxygenated chalcones with urea-hydrogen peroxide complex in THF in the presence of DBU and poly-(l)- or -(d)-leucine, followed by TBTH/AIBN catalysed ring opening, afforded β-hydroxydihydrochalcones in moderate to high enantiomeric excess and yield. This represents the first stereoselective route towards this group of flavonoids.
在DBU和聚(l)-或-(d)-亮氨酸存在下,用脲-过氧化氢络合物在THF中将一系列多加氧查耳酮环氧化,然后用TBTH / AIBN催化开环,得到β-羟基二氢查耳酮中度至高对映体过量和收率。这代表了朝向这组类黄酮的第一个立体选择性途径。