Abstract
Commercially available molybdenum hexacarbonyl serves as a convenient and solid carbon monoxide source in palladium-catalyzed aminocarbonylations of aryl bromides and iodides. This improved microwave protocol, relying on DBU as base and THF as solvent, enables rapid couplings using otherwise sluggish anilines, tert-butylamine, and free amino acids. In addition, Cr(CO)(6) and W(CO)(6) were found to be useful alternative CO-releasing reagents. Altogether, 16 different aromatic amides were synthesized under air in 35-95% yield after only 15 min of controlled microwave irradiation.
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