Catalyzed Asymmetric Diels−Alder Reaction of Benzoquinone. Total Synthesis of (−)-Ibogamine
作者:James D. White、Younggi Choi
DOI:10.1021/ol0001463
日期:2000.7.1
The Diels-Alder addition of diene 2 with benzoquinone catalyzed by (S)-BINOL-TiCl(2) produced cycloadduct 5 in >65% yield and 87% ee. The cycloadduct was transformed into (-)-ibogamine in nine steps (10% overall yield from benzoquinone). A model for the transition state leading to 5 is proposed.
由(S)-BINOL-TiCl(2)催化的二烯2与苯醌的Diels-Alder加成反应产生环加合物5,收率> 65%,ee为87%。通过九个步骤将环加合物转化为(-)-异烟酰胺(苯醌的总产率为10%)。提出了导致5的过渡态模型。