Approaches to the Synthesis of 2,3-Dihaloanilines. Useful Precursors of 4-Functionalized-1<i>H</i>-indoles
作者:Verónica Guilarte、M. Pilar Castroviejo、Patricia García-García、Manuel A. Fernández-Rodríguez、Roberto Sanz
DOI:10.1021/jo200406f
日期:2011.5.6
2,3-Dihaloanilines have been proved as useful starting materials for synthesizing 4-halo-1H-indoles. Subsequent or in situ functionalization of the prepared haloindoles allows the access to a wide variety of 2,4- or 2,3,4-regioselectively functionalized indoles in good overall yields. As no efficient synthetic routes to 2,3-dihaloanilines have been described in the literature, different approaches
已经证明2,3-二卤代苯胺是用于合成4-卤代-1 H-吲哚的有用的起始原料。所制备的卤代吲哚的随后或原位官能化使得能够以良好的总收率获得各种2,4-或2,3,4-区域选择性官能化的吲哚。由于在文献中没有描述制备2,3-二卤代苯胺的有效合成途径,因此现在提出了制备这些1,2,3-官能化的芳族前体的不同方法。最一般的涉及从相应的2,3-二卤代苯酚的Smiles重排,并允许以直接且合成上有用的方式制备2,3-二卤代苯胺。