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Bromo- or Methoxy-Group-Promoted Umpolung Electron Transfer Enabled, Visible-Light-Mediated Synthesis of 2-Substituted Indole-3-glyoxylates

Vidyasagar, Adiyala ; Shi, Jinwei ; Kreitmeier, Peter ; Reiser, Oliver


A visible-light-mediated radical tandem cyclization of ortho-isocyano-alpha-bromo cinnamates to 2-substituted indole-3-glyoxylates is achieved by formation of both C-C/C-S and C-O bonds. The reaction proceeds through a hitherto unprecedented bromine- or methoxy-group-promoted umpolung back electron transfer from an a-carbonyl radical to the photocatalyst. This method allows preparation of diverse ...


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