首页> 外文期刊>Chemistry: A European journal >A New Efficient Route for Multigram Asymmetric Synthesis of Alkannin and Shikonin
【24h】

A New Efficient Route for Multigram Asymmetric Synthesis of Alkannin and Shikonin

机译:烷烃和紫草宁多重克不对称合成的新有效途径

获取原文
获取原文并翻译 | 示例
           

摘要

A short and convergent approach for the synthesis of alkannin, shikonin and shikalkin is presented. A Hauser-type annulation of cyanophthalide 26 with enone 7 affords the complete aromatic system in just one step with concomitant atachment of the entire side chain. Subsequent Corey's oxazaboraolidine mediated asymmetric reduction of the above advanced intermediate, leads to the required isomer in high enantiomeric excess. Finally, a selective and high yielding deprotection protocol furnishes the title compoudns as pure crystlaline precipitates. Thus, a mutligram synthesis of shikonin, alkannin and shikalkin is achieved in hgih yield and enantioselectivity.
机译:提出了一种短而收敛的链烷烃,紫草宁和shikalkin合成方法。具有烯酮7的氰基邻苯二甲酸酯26的豪瑟型环化仅一步就提供了完整的芳族体系,同时伴随着整个侧链的结合。随后的Corey's恶唑三硼烷介导的上述高级中间体的不对称还原,导致对映体过量的所需异构体。最后,选择性的和高产率的脱保护方案为标题化合物提供了纯的冰晶碱沉淀。因此,在产量和对映选择性方面,紫草素,链烷宁和紫草金的多谱图合成得以实现。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号