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Keywords:

  • decatungstate anion;
  • flow reactions;
  • γ-lactones;
  • multistep synthesis;
  • photocatalysis;
  • Various substituted γ-lactones were easily prepared under flow conditions by photocatalytic addition of aldehydes onto unsaturated esters followed by reduction of the resulting γ-keto esters with sodium borohydride (NaBH4). The γ-hydroxy esters obtained easily cyclized to give the desired heterocycles in good yields.
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