Abstract
Synthesis of regioisomeric 8-trifluoromethyl-4,5-dihydro-3H-imidazo[4',5':5,6]benz[1,2-d]isoxazoles and 8-trifluoromethyl-4,5-dihydro-3H-imidazo[4',5':3,4]benz[1,2-c]isoxazolones was realized by one-pot oxidation of 3-trifluromethyl-6,7-dihydrobenz[d]- or [c]isoxazoles with selenium dioxide in glacial acetic acid followed by a condensation of formed in situ 3-trifluromethyl-6,7-dihydrobenz[d]- or [c]isoxazole-4,5-diones with benzaldehydes in the presence of ammonium acetate.
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