An Iron(II) Chloride‐Promoted Radical Cascade Methylation or α‐Chloro‐β‐methylation of N‐Arylacrylamides with Dimethyl Sulfoxide

A free radical‐initiated methylation and/or α‐chloro‐β‐methylation of N‐arylacrylamides with dimethyl sulfoxide under the analogous Fenton reaction condition has been developed, which provides an effective and facile cascade strategy for the synthesis of oxindoles and chlorinated amides.