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
Regioselective Synthesis of 4- and 7-Alkoxyindoles from 2,3-Dihalophenols: Application to the Preparation of Indole Inhibitors of Phospholipase A<sub>2</sub>
作者:Roberto Sanz、M. Pilar Castroviejo、Verónica Guilarte、Antonio Pérez、Francisco J. Fañanás
DOI:10.1021/jo070643y
日期:2007.7.1
An efficient and regioselectivesynthesis of 4- and 7-alkoxyindoles has been developed from commercially available starting materials such as 3-halophenols and 3-chloroanisole. Directed ortho-metalation followed by two palladium-catalyzed processes, a Sonogashira coupling and a tandem amination/cyclization reaction, allows the synthesis of regiochemically pure 4- and 7-substituted indoles. This strategy