Total Synthesis of (<i>S</i>)-(+)-Imperanene. Effective Use of Regio- and Enantioselective Intramolecular Carbon−Hydrogen Insertion Reactions Catalyzed by Chiral Dirhodium(II) Carboxamidates
作者:Michael P. Doyle、Wenhao Hu、Marcela V. Valenzuela
DOI:10.1021/jo016220s
日期:2002.5.1
completed in 12 steps from a commercially available cinnamic acid. The key step is highly enantioselective carbon-hydrogen insertion from a diazoacetate using a chiral dirhodium(II) carboxamidate catalyst. An elimination process essential to the construction has been optimized to avoid intramolecular Friedel-Crafts alkylation.
中药中的天然产物(S)-(+)-imperanene的总合成已由市售肉桂酸分12步完成。关键步骤是使用手性氨基羧酸二铵(II)催化剂从重氮乙酸盐中插入高度对映选择性的碳氢。优化了该结构必不可少的消除工艺,以避免分子内Friedel-Crafts烷基化。