H 27;3-ethyl-1-(3-trifluoromethyl-phenyl)-1H-quinazoline-2,4-dione;2,4(1H,3H)Quinazolinedione, 3-ethyl-1-(3-(trifluoromethyl)phenyl)-;3-ethyl-1-[3-(trifluoromethyl)phenyl]quinazoline-2,4-dione
A mild, ligand-free method of arylating 2,4-quinazolinediones using arylboronates in the presence of copper salts is described. The reaction is tolerant of a variety of functional groups and works for arylboronic acid, arylboronic ester, and aryltrifluoroboronate donors. A catalytic variant is also described.