Highly Stereoselective Asymmetric 6π-Azaelectrocyclization Utilizing the Novel 7-Alkyl Substituted <i>cis</i>-1-Amino-2-indanols: Formal Synthesis of 20-Epiuleine
作者:Katsunori Tanaka、Shigeo Katsumura
DOI:10.1021/ja026464+
日期:2002.8.1
Highly stereoselective asymmetric 6pi-azaelectrocyclization was achieved with generality, based on the reaction between the (E)-3-carbonyl-2,4,6-trienal compounds and the (-)-7-alkyl-cis-1-amino-2-indanol derivatives as the effective novel chiral amines. Furthermore, the chiral auxiliaries of the cyclized products obtained were efficiently removed by the novel manganese dioxide oxidation under remarkably
基于 (E)-3-羰基-2,4,6-三烯醛化合物与 (-)-7-烷基-顺-1-氨基-2 之间的反应,普遍实现了高度立体选择性的不对称 6pi-氮杂电环化-茚满醇衍生物作为有效的新型手性胺。此外,在非常温和的条件下,通过新型二氧化锰氧化有效去除了所得环化产物的手性助剂,该方法成功应用于光学活性 20-epiuleine 的正式合成。