A short and efficient asymmetric synthesis of (−)-frontalin, (−)-exo-isobrevicomin and a volatile contributor of beer-aroma
作者:Surendra Singh、Patrick J. Guiry
DOI:10.1016/j.tet.2010.05.032
日期:2010.7
The natural products, (−)-frontalin and (+)-exo-isobrevicomin were synthesized employing Sharpless asymmetric epoxidation and ZrCl4-catalyzed intramolecular acetalization as the key steps. (−)-Frontalin was synthesized in three steps with a 61.4% overall yield and 89.9% ee and (−)-exo-isobrevicomin also obtained in an overall satisfactory yield of 10.1% and 97% ee. We have also synthesized the volatile
以Sharpless不对称环氧化和ZrCl 4催化的分子内缩醛化为关键步骤合成了天然产物(-)-额叶蛋白和(+)-外-异brevicomin 。(-)-Frontalin分三步合成,总产率为61.4%,ee为89.9%,(-)- exo- isobrevicomin也以10.1%和97%ee的总令人满意的产率获得。我们还合成了96%ee的啤酒香气的挥发性成分。