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An efficient Ag‐promoted reaction of N‐propargyl indoles and arylsulfinic acids to 2‐sulfonated‐9H‐pyrrolo[1,2‐a]indoles was developed. Using arylsulfinic acids as stable and less toxic sulfonylation agent, the reaction proceeded smoothly to give the desired products in good yields and excellent regioselectivity with a broad substrate scope.
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