Ausgehend von dem Oxazolidon (1) (Darstellung bekannt) wird das Iodid (IVb) dargestellt, das zur Strukturbestätigung über (IVc) in den Ester (VII) umgewandelt wird.
Die durch Diazogruppen‐Übertragung erhaltenen Diazoketo‐ ester (I) werden in Gegenwart von Rh‐acetat zu den Cyclopentanon‐2‐carbonsäureestern (II) cyclisiert.
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