The regioselective Baeyer-Villiger oxidation of a wide range of α,ααdisubstituted β-ketoesters has been developed to synthesize, in good yields, α,α-disubstituted α-acetoxy esters. The reactions were performed using m-chloroperbenzoic acid in the presence of triflic acid. The rearrangement was shown to occur with retention of configuration of the migrating group. The corresponding α,ααdisubstituted α-hydroxy acids were obtained in good yields, after hydrolysis.
Keywords: baeyer-villiger oxidation, ketoesters, m-chloro perbenzoic acid, triflic acid, hydroxy acid
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