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  • Title: Organocatalytic hetero [4+2] cycloaddition reactions of 2-(1-alkynyl)-2-alkene-1-ones: metal-free access to highly substituted 4H-pyrans.
    Author: Yu X, Cao Z, Zhang J.
    Journal: Org Biomol Chem; 2010 Nov 21; 8(22):5059-61. PubMed ID: 20871909.
    Abstract:
    Highly substituted 4H-pyrans can be smoothly synthesized from readily available 2-(1-alkynyl)-2-alkene-1-ones by DBU- or n-Bu(3)P catalyzed hetero-[4+2] cycloaddition reactions, in which 2-(1-alkynyl)-2-alkene-1-ones act as both heterodiene and heterodinenophile.
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