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Ring expansions using Baeyer-Villager oxidation: An efficient strategy for the construction of substituted AB-ring systemsKeywords: Bicyclic lactones , thermal , cyclcoaddition , cyclobutanone , Baeyer-Villager oxidation . Abstract: An approach to the synthesis of regioselective cis fused substituted AB-ring systems is described. The key step involves a thermal cycloaddition to substituted cyclobutanones. The resulting cyclobutanones were subjected to regioselective Baeyer-Villager oxidation protocol
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