Thieno[2,3-b]indoles can be synthesised in 70–80 % yield by the sulfoxide rearrangement of 2-(4′-aryloxybut-2′-ynylthio)-1-methylindoles. The substrates are prepared by phase-transfer-catalysed alkylation of 1-methylindoline-2-thione with 1-aryloxy-4-chlorobut-2-ynes.
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