Article ID Journal Published Year Pages File Type
5270482 Tetrahedron Letters 2014 4 Pages PDF
Abstract

The 4-(o-propargyloxy)styrylcoumarins are prepared by the condensation of O-propargylated salicylaldehyde with substituted coumarin-4-acetic acids. The intramolecular Diels-Alder reaction of 4-(o-propargyloxy)styrylcoumarins, without any catalyst gives fused-ring coumarins. The reaction in boiling nitrobenzene leads to aromatization of the initial Diels-Alder adduct and these aromatized products are highly fluorescent.

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Physical Sciences and Engineering Chemistry Organic Chemistry
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