Abstract
The 1:1 intermediate generated by the addition of triphenylphosphine to dialkyl acetylenedicarboxylates is trapped by alizarin to produce alkyl 6,11-dihydro-12-hydroxy-2,6,11-trioxo-2H-naphtho[2,3-g]chromene-4-carboxylates in good yields. When ethyl propiolate was used, the reaction afforded ethyl 6,11-dihydro-6,11-dioxoanthra[1,2-d][1,3]-dioxole-2-acetate. The reaction of dialkyl acetylenedicarboxylates, alizarin, and trialkyl phosphites produced dialkyl 2-(dialkoxyphosphoryl)-3-(9,10-dihydro-1-hydroxy-9,10-dioxoanthracen-2-yloxy)succinates.
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Yavari, I., Azad, L. & Sanaeishoar, T. Synthesis of new functionalized alizarins from alizarin, acetylenic esters, and phosphorus nucleophiles. Monatsh Chem 142, 643–647 (2011). https://doi.org/10.1007/s00706-011-0489-3
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DOI: https://doi.org/10.1007/s00706-011-0489-3