Jm. Mellor et S. Mohammed, SYNTHESIS OF FUSED ACETAL DERIVATIVES BY MANGANIC ACETATE PROMOTED ADDITIONS TO ENDOCYCLIC ENOL ETHERS, Tetrahedron, 49(34), 1993, pp. 7557-7566
Reaction of manganic acetate in acetic acid with beta-diketones and be
ta-ketoesters leads to generation of intermediates, which add efficien
tly to endocyclic umaturated enol ethers to afford fused acetals.