Catalyst- and Base-Controlled Site-Selective sp2 and sp3 Direct Arylation of 5,7-Dimethyl-2-phenylpyrazolo[1,5-a]pyrimidine Using Aryl Bromides
作者:Ibtissam Bassoude、Sabine Berteina-Raboin、Stéphane Massip、Jean-Michel Leger、Christian Jarry、El Mokhtar Essassi、Gérald Guillaumet
DOI:10.1002/ejoc.201101833
日期:2012.5
The palladium-catalyzed direct C–H arylation of various heterocyclic is now recognized to be the most effective methodology for making aromatic compounds. In this paper, we present a new approach to control the site-selective direct C–H arylation of both sp2 and sp3 sites in 5,7-dimethyl-2-phenylpyrazolo[1,5-a]pyrimidine by using aryl bromides. The desired compounds were obtained in satisfactory yields
钯催化的各种杂环的直接 C-H 芳基化现在被认为是制备芳香族化合物的最有效方法。在本文中,我们提出了一种新方法,通过使用芳基溴化物来控制 5,7-二甲基-2-苯基吡唑并 [1,5-a] 嘧啶中 sp2 和 sp3 位点的位点选择性直接 C-H 芳基化。以令人满意的产率获得了所需的化合物。研究了包括催化剂、碱和溶剂在内的每个反应参数的影响。