Ethers, enol with peroxy acids

Enol ethers, and in particular silylated ends (see Volume 2, Chapter 2.3), react with peroxy acid reagents to give initially a silyloxy qpoxide, which rearranges with silyl migration to yield an a-silyloxy ketone, " as in Scheme 3. The net result is that a ketone is converted to a protected a-hydroxy ketone, and the stereochemistry b determined by the least hindered approach of the peroxy acid to the enol. 

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