Synthesis of Arylated Pyrazoles by Site-Selective Suzuki-Miyaura Reactions of Tribromopyrazoles
作者:Peter Langer、Rasheed Khera、Asad Ali、Munawar Hussain、Jovana Tatar、Alexander Villinger
DOI:10.1055/s-0030-1258489
日期:2010.8
The first Suzuki―Miyaura reactions of N-protected tribromopyrazoles are reported. Their reaction with three, two, or one equivalents of arylboronic acids afforded 3,4,5-triarylpyrazoles, 3,5-diaryl-4-bromopyrazoles, or 5-aryl-3,4-dibromopyrazoles, respectively. All reactions proceeded with very good site-selectivity.
首次报道了 N 保护的三溴吡唑的 Suzuki-Miyaura 反应。它们与三、二或一当量的芳基硼酸反应分别得到 3,4,5-三芳基吡唑、3,5-二芳基-4-溴吡唑或 5-芳基-3,4-二溴吡唑。所有反应都以非常好的位点选择性进行。