Keywords
Chromenes; acetylenic esters; trimethylamine; cyclic 1,3-diketones
Abstract
The reaction of dialkyl acetylenedicarboxylates with six-membered cyclic 1,3-diketones such as 1,3-cyclohexanedione or 5,5-dimethyl-1,3-cyclohexanedione in the presence of a catalytic amount of trimethylamine, triethylamine or tributylamine in CH2Cl2 leads to alkyl 2,5-dioxo-5,6,7,8-tetrahydro-2H-chromene-4-carboxylates in good yields.
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