Synthesis of Axinohydantoins

Abstract
A short synthesis of the hydantoin-containing marine sponge metabolites axinohydantoins is described. A key feature of the synthesis is a putative biomimetic, intramolecular cyclization of α-functionalized imidazolone 5, which affords the tricyclic pyrroloazepinone framework comprising 6. In addition, the conversion of imidazolones to α,β-unsaturated hydantoins is outlined and represents a new approach to these heterocyclic systems.

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