As part of our ongoing interest in the synthesis of benz-annelated heterocycles from O-substituted benzylfurans, recyclization of [ O-(hydroxymethyl)aryl]difurylmethanes was studied. It was shown that, under acidic conditions, the O-hydroxymethyl group in these compounds acts as a nucleophile and tetracyclic isochromene derivatives are formed via a recyclization-cyclization tandem sequence. Alternatively