Das phenylsulfonylsubstituierte p‐Benzochinon (I) reagiert mit den N‐Alkyl‐β‐ aminocrotonsäureestern (II) zu den Addukten (III), die im Falle von (IIIa), (IIIb) und (IIId) beim Erhitzen mit Mineralsäuren in das Benzofuran‐Derivat (IV) übergehen.
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