作者:Xiaoshui Peng、Anpai Li、Jiangping Lu、Qiaoling Wang、Xinfu Pan、Albert S.C Chan
DOI:10.1016/s0040-4020(02)00791-3
日期:2002.8
A facile enantioselective route to highly functionalized α,β-unsaturated -δ-lactones has allowed for the synthesis of (+)-isoaltholactone in 6.4% overall yield from furylmethanol. This approach derived its asymmetry by applying Sharpless kinetic resolution on racemic 2-furylmethanol. The resulting pyranone was produced in high enantioexcess and was stereoselectively transformed into (+)-isoaltholactone
到高度官能化的α,β-不饱和-δ-内酯的简便对映选择性路线已使呋喃甲醇以6.4%的总收率合成(+)-异甲内酯。该方法通过在外消旋2-呋喃甲醇上应用Sharpless动力学拆分来获得其不对称性。产生的吡喃酮以高对映体过量产生,并通过高度非对映选择性环氧化和关键的PPTS催化的分子内环化反应被立体选择性地转化为(+)-异甲内酯。