Abstract
Regioselective synthesis of a hitherto unreported thiocoumarin-annulated furopyran moiety was achieved by the application of Claisen rearrangement in which a second Claisen rearrangement was achieved by anhydrous aluminum chloride. The precursor endocyclic compounds for catalyzed Claisen rearrangement were synthesized by the thermal [3,3] sigmatropic rearrangement of the corresponding ether. Keywords: Anhydrous aluminum chloride, sequential Claisen rearrangement, intramolecular hydroaryloxylation, furopyrans, 4-hydroxythiocoumarin, 1-aryloxy-4-chlorobut-2-yne
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