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Communication • J. Braz. Chem. Soc. 26 (2) • Feb 2015 • https://doi.org/10.5935/0103-5053.20140252   copy

Three-Component Reactions of 7-Hydroxy Coumarin Derivatives, Acetylenic Esters and Aromatic Aldehydes in the Presence of NEt3

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Three-component reactions of 7-hydroxy-4-methyl coumarin or 7-hydroxy-4-(trifluoromethyl) coumarin, dialkyl acetylenedicarboxylates and aromatic aldehydes in the presence of NEt3 lead to dialkyl (2E)-2-[aryl(hydroxy)methyl]-3-[(4-methyl-2-oxo-2H-chromen-7-yl)oxy]but-2-ene dioate or dialkyl (2E)-2-[aryl(hydroxy)methyl]-3-{(2-oxo-4-(trifluoromethyl)-2H-chromen-7-yl)oxy} but-2-ene dioate in good yields under mild reaction conditions.

7-hydroxy coumarins; dialkyl acetylenedicarboxylates; aromatic aldehydes; three-component reaction

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