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A one-pot microwave-assisted aza -Friedel-Crafts arylation of N -acyliminium ions, generated in situ from o -formyl carbamates and different amines, is reported. This metal-free protocol provides rapid access to diverse 4-aryl 3,4-dihydroquinazolinones in excellent yield without any aqueous workup. A solvent-directed process for the selective aza -Friedel-Crafts arylation of electron-rich aryl/heteroaryl/butenyl-tethered N -acyliminium ions is also described.

Microwave-Assisted aza-Friedel–Crafts Arylation of N-Acyliminium Ions: Expedient Access to 4-Aryl 3,4-Dihydroquinazolinones