Scheme 3. Comparison of different α -functionalization conditions for a series of different substrates.
[a] Yields of hydroxylated products. [b] 40 equiv of H2O @ 3 mA, 40 mol% ABNO. [c] 30 equiv of H2O @ 5 mA, 60 mol% PhCO2ABNO. [d] 50 equiv of H2O @ 5 mA, 60 mol% ketoABNO.1H NMR yield was shown with mesitylene as internal standard.