Allylic derivatives lactonization/lactamization

Insertion of [Fe(CO)5] into the four-membered ring of a-pinene gave a a, allyl complex which was used for further synthesis. Alkylation of tricarbonyl iron diene and cationic dienyl complexes also gave o.ti allyl species. A o, allyl lactone complex was used to form the lactone ring in the synthesis of valilalactone, a p-lactone esterase inhibitor,and a related allyl lactam complex has been derived from prolineJ ... 

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