Die Kondensation der Hydroxycumarine (I) mit der Brombenzoesäure (II) in Gegenwart von Cu(II)‐chlorid in Pyridin liefert unter gleichzeitiger Cyclisierung der sich bildenden Äther (III) die Titelverbindungen (IV); analog werden aus entsprechenden Cumarinen (I) mit den Benzoesäuren (V) die Verbindungen (VI) erhalten.
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