Novel routes to 1 -aryl-5,6-dialkoxy-l,3-dihydrobenzo[cJthiophene 2'2-dioxides (1 3) and to the corresponding benzo[c]furan (8) have been developed; these species yield quinodimethanes (1 2) via thermal extrusion of SO, and isobenzofurans (5c) in an acid-catalysed process, respectively, which then react with various dienophiles to provide structural analogues of the aryltetralin and arylnaphthalene lignans. OMe

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Das Sulfon (Va) wird ausgehend von dem Aldehyd (I) synthetisiert und mit einer Reihe von Dienophilen umgesetzt.