Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 56, Issue 14, Pages 3951-3955Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201612311
Keywords
aryne; cross-coupling; indole; radicals; transition metal-free synthesis
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Funding
- NIH NIGMS [R01GM111638]
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We report an unprecedented transition metal-free coupling of indoles with aryl halides. The reaction is promoted by KOtBu and is regioselective for C3 over N. The use of degassed solvents devoid of oxygen is necessary for the success of the transformation. Preliminary studies implicate a hybrid mechanism that involves both aryne intermediates and non-propagative radical processes. Electron transfer is alsoadistinct possibility. These conclusions were substantiated by EPR data, isotopic labeling studies, and the use of radical scavengers and electron transfer inhibitors.
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