Electron Transfer Photoredox Catalysis: Intramolecular Radical Addition to Indoles and Pyrroles
作者:Joseph W. Tucker、Jagan M. R. Narayanam、Scott W. Krabbe、Corey R. J. Stephenson
DOI:10.1021/ol902703k
日期:2010.1.15
The utilization of the photoredox catalyst, tris(2,2′-bipyridyl)ruthenium dichloride, and a household light bulb to effect radical cyclizations onto indoles and pyrroles at room temperature is reported. A reactive free radical intermediate is generated via the reduction of an activated C−Br bond by the single electron reductant, Ru(I), generated in a visiblelightinduced photocatalytic cycle. This
Expanding the Scope of Mn(OAc)<sub>3</sub>-Mediated Cyclizations: Synthesis of the Tetracyclic Core of Tronocarpine
作者:Jakob Magolan、Michael A. Kerr
DOI:10.1021/ol061698+
日期:2006.9.1
Pyrroles, indoles, and surprisingly, indolines, when equipped with a pendant malonyl group on the nitrogen atom, were effective substrates in a Mn(III)-mediated oxidative cyclization reaction, yielding the 1,2-annulated products in good to excellent yields. When indole acetonitrile was used as a substrate this method provided a rapid synthesis of a tetracyclic tronocarpine subunit.