A Combination of Tandem Amine-Exchange/Heterocyclization and Biaryl Coupling Reactions for the Straightforward Preparation of Phenanthro[9,10-<i>d</i>]pyrazoles
作者:Roberto Olivera、Raul SanMartin、Esther Domínguez
DOI:10.1021/jo000609i
日期:2000.10.1
The tandem amine-exchange/heterocyclization of enaminoketones is successfully applied to the regioselective preparation of a series of new 4,5-diarylpyrazoles by reaction of phenylhydrazine and several 3-N,N-(dimethylamino)-1,2-diarylpropenones. The comparison of a vast array of biaryl coupling procedures provides general, complementary approaches to new phenanthro[9,10-d]pyrazoles. The most efficient
通过苯肼与几种3-N,N-(二甲基氨基)-1,2-二芳基丙烯酮的反应,烯胺酮的串联胺交换/杂环化成功地用于一系列新的4,5-二芳基吡唑的区域选择性制备。大量的联芳基偶联方法的比较为新的菲[9,10-d]吡唑提供了通用的补充方法。在构建四环体系的最后一步中,最有效的方法是基于邻位邻邻二烷基卤代二芳基吡唑的Stille型串联甲锡烷基化-联芳基偶联以及非卤代前体的高价碘介导的非酚氧化偶联。