Enantioselective synthesis of flavonoids. Part 51. Poly-oxygenated β-hydroxydihydrochalcones
作者:Reinier J.J. Nel、Pieter S. van Heerden、Hendrik van Rensburg、Daneel Ferreira
DOI:10.1016/s0040-4039(98)01064-8
日期:1998.7
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 ringopening, afforded β-hydroxydihydrochalcones in moderate to high enantiomeric excess and yield.
在DBU和聚(l)-或-(d)-亮氨酸存在下,用脲-过氧化氢络合物在THF中用尿素-过氧化氢络合物环氧化一系列多加氧查耳酮,然后用TBTH / AIBN催化开环,得到β-羟基二氢查耳酮中度到高对映体过量和收率。