epoxidation, while and the critical oxidative coupling was achieved under the PIFA/PTA conditions. Comparison of optical rotations for the synthetic and natural samples allowed for unequivocal assignment of the absolute configurations of the natural dracaenones.
首次以对映纯形式合成了几种
龙脑烯酮。使用Evans醛醇缩合或手性氧化剂介导的不对称环氧化,在C-7的关键手性中心安装了明确的立体
化学,同时在
PIFA /
PTA条件下实现了关键的氧化偶联。合成样品和天然样品的旋光度比较可以明确确定天然
龙脑烯酮的绝对构型。