Improved Synthesis of Pyrroles and Indolesvia Lewis Acid-Catalyzed Mukaiyama–Michael-Type Addition/Heterocyclization of Enolsilyl Derivatives on 1,2-Diaza-1,3-Butadienes. Role of the Catalyst in the Reaction Mechanism
作者:Orazio A. Attanasi、Gianfranco Favi、Paolino Filippone、Samuele Lillini、Fabio Mantellini、Domenico Spinelli、Marco Stenta
DOI:10.1002/adsc.200600362
日期:2007.4.2
The Mukaiyama–Michael-type addition of various silyl ketene acetals or silyl enol ethers on some 1,2-diaza-1,3-butadienes proceeds at room temperature in the presence of catalytic amounts of Lewis acid affording by heterocyclization 1-aminopyrrol-2-ones and 1-aminopyrroles, respectively. 1-Aminoindoles have been also obtained by the same addition of 2-(trimethylsilyloxy)-1,3-cyclohexadiene on some