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

Article abstract of DOI:10.1016/S0040-4020(01)87231-8

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 a