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Main observation and conclusionrnThe intramolecular cyclization of 2-alkynylanilines mediated by DMSO/SOCl2 was found to afford biologically interesting 3-methylthioindoles,which are rarely obtained by the exiting methods.DMSO could also be replaced with its deuterated counterpart,enabling the method applicable to the construction of indole skeleton bearing a SCD3 moiety at its 3-position.