Synthesis of 1,7-epoxycyclononanes and 1,8-epoxycyclodecanes by β-fragmentation reactions using LTA and I2

The treatment of derivatives on C3 of 6-hydroxy-2,7-dimethyl-11-oxatricyclo[6.2.1.02,6]undecan-4-one with lead tetraacetate and iodine, gave, in a good yield, 1,7-epoxycyclononanes or 1,8-epoxycyclodecanes, depending on the type of substitution in α to the ketone on C4 of substrates.