Abstract
AbstractA copper‐catalyzed formylation reaction has been developed by employing oxygen (O2) as the clean oxidant. The CH bonds of indoles were C‐3‐formylated by tetramethylethylenediamine (TMEDA) and water (H2O; in situ formed and external added water) as the carbonyl source in moderate to good yields with good functional group tolerance. Thus, it represents a facile procedure leading to 3‐formylindoles.
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