Exocyclic Enol Ether Research Articles

Synthesis of spirocyclic acetals by manganic acetate promoted additions to exocyclic enol ethers

Reaction of β-ketoesters and β-dicarbonyl compounds with manganic acetate in acetic acid gives intermediates, which add to exocyclic enol ethers to afford a variety of interesting spirocyclic acetals. As the exocyclic enol ethers are shown to be readily accessible, the results constitute a useful route based on radical chemistry to the synthesis of unsaturated spiroacetals.

Synthesis of oxygen spirocycles by manganic acetate promoted additions to exocyclic enol ether derivatives

Oxidative addition, promoted by manganic acetate, of β-dicarbonyl compounds to enol lactones and related enol derivatives having an exocyclic double bond affords spirocyclic products, and addition to endocyclic enol ethers gives fused acetals and ketals.