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  • Title: Synthesis of substituted chromenes through the DABCO-catalyzed reaction of but-3-yn-2-one and methyl propiolate with salicyl N-tosylimines (DABCO = 1,4-diazabicyclo[2.2.2]octane).
    Author: Shi YL, Shi M.
    Journal: Chemistry; 2006 Apr 12; 12(12):3374-8. PubMed ID: 16470561.
    Abstract:
    The DABCO-catalyzed (DABCO = 1,4-diazabicyclo[2.2.2]octane) reaction of but-3-yn-2-one and methyl propiolate with salicyl N-tosylimines yields highly functionalized chromenes and has been thoroughly investigated; the rational mechanism for the reaction has been demonstrated on the basis of 1H NMR spectroscopic investigation.
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