作者:Susana Hernández、Isabel Moreno、Raul SanMartin、María Teresa Herrero、Esther Domínguez
DOI:10.1039/c0ob00812e
日期:——
A series of novel pyrazolodibenzo[1,4]diazepines has been synthesized with good overall yields. The diarylpyrazole intermediates, with structure similarity to biologically relevant compounds such as currently marketed drugs like rimonabant or celecoxib, were prepared by a tandem sequence amine-exchange/heterocyclization starting from readily available enaminones and arylhydrazines. The key step of this efficient methodology was Caryl–N bond construction, accomplished by a palladium-catalyzed intramolecular N-arylation reaction, which was conducted in both homogeneous and polymer-supported versions. Reaction scope of such protocols and recycling of the heterogeneous catalyst were also examined.
一系列新型吡唑并二苯并[1,4]二氮杂䓬类化合物已被合成,总产率良好。通过对易得的烯胺酮和芳基肼进行串联序列胺交换/杂环化反应,制备了结构与生物相关化合物(如现已上市的药物如利莫那班或塞来昔布)相似的二芳基吡唘中间体。该高效方法的关键步骤是通过钯催化的分子内N-芳基化反应实现Caryl-N键的构建,该反应在均相和聚合物支持的版本中均被实施。对这些反应方案的适用范围以及非均相催化剂的回收进行了考察。