Total Synthesis of (−)-Balanol, All Stereoisomers, TheirN-Tosyl Analogues, and Fully Protected Ophiocordin: An Easy Route to Hexahydroazepine Cores from Garner Aldehydes
作者:Ajay Kumar Srivastava、Gautam Panda
DOI:10.1002/chem.200701991
日期:2008.5.19
(-)-balanol and all of its stereoisomers starting from easily available Garner aldehydes are described. Diastereoselective Grignard reactions on Garner aldehydes and ring-closing metatheses are the key steps for the construction of hexahydroazepine subunits. The benzophenone subunits were constructed through coupling of suitably functionalized aromatic aldehyde and bromo components. The synthetic route
描述了从容易获得的加纳醛开始的(-)-巴拉醇及其所有立体异构体的总合成。加纳醛和闭环易位的非对映选择性格氏反应是构建六氢氮杂亚基亚基的关键步骤。二苯甲酮亚基通过适当官能化的芳族醛和溴组分的偶联而构建。合成途径构成了方便且可扩展的反应序列,以产生所有的巴拉诺尔立体异构体。进一步探索了该方法用于合成Balanol和完全保护的ophiocordin的N-甲苯磺酰基类似物的方法。