Stereodivergent synthesis of the 2,3,5,6-tetrasubstituted piperidine ring system: an application to the synthesis of alkaloids and from poison frogs
作者:Naoki Toyooka、Ayako Fukutome、Hiroyuki Shinoda、Hideo Nemoto
DOI:10.1016/j.tet.2004.05.039
日期:2004.7
Stereodivergent synthesis of the 2,3,5,6-tetrasubstituted piperidine ring system has been achieved by sequential stereocontrolled Michael-type conjugate addition reaction of appropriate enaminoesters. This methodology has been applied to the total syntheses of the poison frog alkaloids 223A and 205B. The relative stereochemistry of natural 223A at the 6-position was revised, and the absolute stereochemistry
2,3,5,6-四取代的哌啶环系统的立体发散性合成已通过适当的烯氨基酯的顺序立体控制的迈克尔型共轭加成反应来实现。该方法已应用于毒蛙生物碱223A和205B的总合成。修订了天然223A在6位的相对立体化学,并通过本合成方法确定了天然205B的绝对立体化学。