Synthesis of 2,3-Bis(arylamino)benzofurans and 2,3-Bis(arylimino)-2,3-dihydrobenzofurans by a Lewis Acid Catalyzed Reaction of 2-Aryliminophenols with Aryl Isocyanides
that is based on the reaction of 2-aryliminophenols with aryl isocyanides in the presence of a catalytic amount of boron trifluoride diethyl etherate. The reaction gives 2,3-bis(arylamino)benzofurans, some of which are transformed into 2,3-bis(arylimino)-2,3-dihydrobenzofurans by air oxidation, mostly during workup. benzofurans - o-hydroxybenzylideneamines - isocyanides - boron trifluoride - imidoyl