Development of Highly Stereoselective Asymmetric 6π-Azaelectrocyclization of Conformationally Flexible Linear 1-Azatrienes. From Determination of Multifunctional Chiral Amines, 7-Alkyl <i>cis</i>-1-Amino-2-indanols, to Application as a New Synthetic Strategy: Formal Synthesis of 20-Epiuleine
作者:Katsunori Tanaka、Toyoharu Kobayashi、Hajime Mori、Shigeo Katsumura
DOI:10.1021/jo049381f
日期:2004.9.1
The highly stereoselective asymmetric 6π-azaelectrocyclization was achieved as a general synthetic method based on the reaction between the (E)-3-carbonyl-2,4,6-trienal compounds and the (−)-7-alkyl-cis-1-amino-2-indanol derivatives which are effective chiral amines. The 7-alkyl-substituted 2-indanol moiety of the cyclized products was efficiently removed by the novel manganese dioxide oxidation under
根据(E)-3-羰基-2,4,6-三烯基化合物与(-)-7-烷基-顺式-1-的反应,通过常规合成方法实现了高度立体选择性的不对称6π-氮杂电环化是有效的手性胺的氨基-2-茚满醇衍生物。在明显温和的条件下,通过新型的二氧化锰氧化可有效去除环化产物中的7-烷基取代的2-茚满醇部分,并将该方法成功地用于光学活性的20-表柔比林的形式合成中。