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An organocatalytic asymmetric formal [3+3] cycloaddition reaction of α,β‐unsaturated aldehydes with Nazarov reagents promoted by prolinol derivatives afforded, after oxidation, 3,4‐dihydropyranones in good yields with high enantioselectivities of up to 97% ee.
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Zhu et al. (2008) studied this question.
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