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A biased copper-coin toss: Highly diastereo- and enantioselective copper-catalyzed addition reactions of enesulfonamides to α-keto aldehydes and azodicarboxylates have been developed. Low loadings of the chiral copper catalyst efficiently promoted the reaction (see scheme). The product sulfonylimines could be reduced diastereoselectively to the biologically important chiral sulfonamide compounds.
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Matsubara et al. (2007) studied this question.
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