Abstract
Decarboxylative Michael–type addition of malonic acid half thioesters to chromone‐3‐carboxylic acids has been developed. The reaction has been realized under Brønsted‐base catalysis providing biologically relevant 2‐substituted chromanones in good or very good yields. Mechanistic studies confirmed that the methodology proceeds according to the doubly decarboxylative reaction pathway. The possibility to perform the reaction in an asymmetric fashion has been demonstrated.
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