Acid-catalyzed ring opening in 2-(2-hydroxynaphthalene-1-yl)-pyrrolidine-1-carboxamides: formation of dibenzoxanthenes, diarylmethanes, and calixarenes
2-(2-Hydroxynaphthalene-1-yl)pyrrolidine-1-carboxamides undergo ringopening in the presence of trifluoroacetic acid and 2-naphthol leading to the formation of new substituted dibenzoxanthenes. Reaction of 2-(2-hydroxynaphthalene-1-yl)pyrrolidine-1-carboxamides with polyatomic phenols at the same conditions was found leading to diarylmethane derivatives and calix[4]resorcinols with naphthyl fragment