A. Oku et al., 3-CARBON RING-ENLARGEMENT OF ETHEREAL OXONIUM YLIDES - A VIABLE SYNTHESIS OF MEDIUM-SIZED CYCLIC KETOETHERS, Chemical communications, (9), 1996, pp. 1077-1078
Eight- to eleven-membered cyclic ketoethers are synthesized in a singl
e-step by rhodium(II)-catalysed three-carbon ring-enlargement of diazo
acetonyl-substituted cyclic ethers via bicyclic ethereal oxonium ylide
intermediates.