Regioselective Synthesis of 1-Alkyl- or 1-Aryl-1<i>H</i>-indazoles via Copper-Catalyzed Cyclizations of 2-Haloarylcarbonylic Compounds
作者:Dolores Viña、Esther del Olmo、José L. López-Pérez、Arturo San Feliciano
DOI:10.1021/ol062890e
日期:2007.2.1
[reaction: see text] A general method for the one-step regioselective synthesis of 1-alkyl- or 1-aryl-1H-indazoles from ortho-halogenated alkanoylphenones, benzophenones, and arylcarboxylic acids, via copper-catalyzed amination, was developed by using 0.2% mol of CuO in the presence of K(2)CO(3). The reaction involves amination followed by intramolecular dehydration. Different functionalized alkyl
[反应:参见正文]通过以下方法开发了一种通过邻位卤代烷酰基苯酮,二苯甲酮和芳基羧酸通过铜催化的胺一步一步区域选择性合成1-烷基或1-芳基-1H-吲唑的一般方法。在K(2)CO(3)存在下使用0.2%mol的CuO。该反应涉及胺化,然后进行分子内脱水。将不同的官能化的烷基芳基酮,二芳基酮和苯甲酸衍生物有效地与几种肼偶联。已证明通常用作分子间胺化催化剂的配体对该环化无效。