Die bei Reaktionen der Diazoacetylindole (I) mit den Aminoaldehydacetalen (II) in Gegenwart von Agbenzoat entstehenden Amide (III) gehen beim Erwärmen in l4%igem wäßrigem HCl (oder bei Erwärmung mit Polyphosphorsäure auf 30‐35°C) glatt in die Titelverbindungen (IV) über.
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