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Main observation and conclusion
The reaction of 2‐alkynylanisoles/sulfides with SOCl2 and DMSO was conducted to conveniently furnish the biologically interesting 3‐(methylthio)‐benzo[b]furans/thiophenes via intramolecular cyclization. DMSO acts as a solvent as well as a sulfur source and can also be replaced with DMSO‐d6, enabling the incorporation of the SCD3 moiety of DMSO‐d6 to the 3‐position...
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