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The diarylprolinol ether/HOAc-catalyzed cascade Michael addition and cyclization of aldehydes and alpha-keto-alpha,beta-unsaturated esters proceeds smoothly in water to afford cyclic hemiacetals, which are oxidized to furnish highly functionalized 3,4,5,6-tetrasubstituted dihydropyrones with excellent enantioselectivities.
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Wang et al. (2008) studied this question.
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