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[6,6]- and [6,5]-fused hithero unreported pentacyclic heterocycles have been regioselectively synthesized from 4-(4′-aryloxybut-2′-ynylthio)thiocoumarin in good yields by the application of thermal as well as catalytic Claisen rearrangement.
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Amarta Kumar Pal (2009) studied this question.
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