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We observed an unexpected cyclization of aryl propargyl sulfoxides to 1-benzothiophenes while attempting the in situ preparation of a particular class of allenyl sulfoxides as substrates for intramolecular hydride-shift experiments. A mechanistic rationale for explaining this result, involving a sequence of [2,3] and [3,3] sigmatropic rearrangements and a final conjugate addition, is provided by the previous work of Thyagarajan and Majumdar.

Unexpected new examples of the Thyagarajan-Majumdar tandem cyclization of aryl propargyl sulfoxides