Journal
ORGANIC LETTERS
Volume 10, Issue 20, Pages 4673-4676Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol8019764
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- Japan Science and Technology Agency (JST)
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The biaryl coupling of electron-deficient nitrogen heterocycles and haloarenes can be promoted by potassium t-butoxide alone, without the addition of any exogenous transition metal species. Electron-deficient nitrogen heterocycles such as pyridine, pyridazine, pyrimidine, pyrazine, and quinoxaline are arylated with haloarenes. Control experiments support a radical-based mechanism. Taking these findings into account, radical processes may be partially involved in the reported transition-metal-catalyzed arylation reactions employing t-butoxide bases and haloarenes under elevated temperatures or under microwave irradiation.
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