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In the presence of 25mol% of a polymer-supported chiral sulfonamide, a variety of α-keto esters can be reduced into the corresponding 1,2-diols in good yields and high enantioselectivities using the NaBH 4 /Me 3 SiCl reducing system.
In the presence of 25 mol% of polymer-supported chiral sulfonamide, a variety of β-keto sulfones can be reduced into the corresponding β-hydroxy sulfones in excellent yields and with high enantioselectivities using the reducing system of NaBH 4 /Me 3 SiCl.
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