Heck Arylation of Endocyclic Enecarbamates with Diazonium Salts. Improvements and a Concise Enantioselective Synthesis of (−)-Codonopsinine
作者:Elias A. Severino、Carlos Roque D. Correia
DOI:10.1021/ol005762d
日期:2000.10.1
Total enantioselective synthesis of the natural (-)-codonopsinine was accomplished in seven steps with an overall yield of approximately 16% starting from the five-membered endocyclic enecarbamate 4. The total synthesis features a highly efficient and stereoselective Heck arylation of endocyclic enecarbamate 4 with p-methoxybenzenediazonium tetrafluoroborate and a stereoselective epoxidation/epoxide
天然(-)-codonopsinine的总对映体选择性合成是通过七个步骤完成的,从五元环内氨基甲酸乙酯4开始,总收率约为16%。总合成具有高效,立体选择性的内环氨基甲酸4的Heck芳基化。对甲氧基苯重氮四氟硼酸盐和立体选择性环氧化/环氧化物的开放顺序是关键步骤。