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  • Title: Asymmetric synthesis of spiro-3,4-dihydropyrans via a domino organocatalytic sequence.
    Author: Yao W, Pan L, Wu Y, Ma C.
    Journal: Org Lett; 2010 May 21; 12(10):2422-5. PubMed ID: 20429598.
    Abstract:
    A cinchona alkaloid-catalyzed domino Michael/hemiacetalization reaction of cyclic beta-oxo aldehydes and aromatic beta,gamma-unsaturated alpha-keto esters, resulting in the formation of spiro-dihydropyran architectures in good yield with high stereoselectivity (up to 97% ee), is presented.
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