Die durch Veresterung der o‐Hydroxy‐acetophenone (I) mit den aromatischen Säuren (II) erhaltenen Ester (III) werden mit CuBr, in Dioxan oder THF zu den Derivaten (IV) (38‐77% Ausbeute) bromiert; diese werden nach Baker‐Venkataraman (Erhitzen in THF oder Dioxan in Gegenwart von KOH) zu den Benzoylcumaranonen (V) 60‐40%) cyclisiert.
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