We have achieved a rare‐metal‐free photo‐aerobic intramolecular dehydrogenative couplingreaction from two C—H bonds of indole with malonate. This catalytic system proceeded at room temperature under visible light irradiation with oxygen in the air as a terminal oxidant, and the cyclization products were obtained in good to excellent yields.
作者:Pol Hernández‐Lladó、Kilian Garrec、Daniel C. Schmitt、Jonathan W. Burton
DOI:10.1002/adsc.202101451
日期:2022.5.17
Annulated heteroaromatics can be accessed through the addition of malonyl radicals onto heterocycles. Current methods are applicable to electron-rich heteroaromatics and reliant on transition metals or toxic tin reagents. Here we report a metal-free, visible light-mediated cyclisation of malonates onto 5-ring heteroaromatics using iodomalonates as key intermediates. The iodomalonates are prepared and
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