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So kommt man zu chiralen Ringen: Chirale Azetidin‐3‐one waren einfach aus chiralen N‐Propargylsulfonamiden erhältlich, die wiederum leicht über chirale Sulfinamide zugänglich sind (siehe Schema). Die tert‐Butylsulfonyl‐Schutzgruppe machte weitere Schützungs‐ und Entschützungsschritte unnötig und ließ sich unter sauren Bedingungen vom Azetidinring abspalten.
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