名称:
Synthesis of (±)-14-epi-hydroxydolasta-1(15),7,9-triene and (±)-7-epi-acetoxy-14-epi-hydroxydolasta-1(15),8-diene*Taken in part from the Ph.D. dissertation of Jianhua Yu, University of Georgia, Athens, Georgia, USA, 2009.
摘要:
1,3-二甲基-2-硝基苯被转化为关键的分子内Friedel-Crafts中间体24,经过十个步骤。用TiCl4处理24产生三环烯酮25,收率为61%–75%,具有两个角甲基的必需的反式关系和多个dolastane二萜的显著特征。通过X射线晶体学分析验证了烯酮25的结构。环化产物25促进了(±)-14-epi-hydroxydolasta-1(15),7,9-三烯和(±)-7-epi-acetoxy-14-epi-hydroxydolasta-1(15),8-二烯的简便合成,这些在本文中有详细描述。