Total synthesis of (−)-ephedradine A: an efficient construction of optically active dihydrobenzofuran-ring via C–H insertion reaction
作者:Wataru Kurosawa、Hideki Kobayashi、Toshiyuki Kan、Tohru Fukuyama
DOI:10.1016/j.tet.2004.06.144
日期:2004.10
The stereocontrolled total synthesis of (−)-ephedradine A (1) has been accomplished. Construction of optically active dihydrobenzofuran-ring was performed by a novel asymmetric C–H insertion reaction. After an intramolecular ester–amide exchange reaction and a Sharpless asymmetric aminohydroxylation reaction, construction of the complex macrocyclic ring was performed by Ns-strategy and an intramolecular
(-)-麻黄碱A(1)的立体控制全合成已完成。光学活性的二氢苯并呋喃环的构建是通过新型的不对称C–H插入反应进行的。在分子内酯-酰胺交换反应和Sharpless不对称氨基羟基化反应之后,通过Ns-策略和分子内aza-Wittig反应进行复杂大环的构建。