Abstract
A methanesulfonic acid promoted three-component reaction has been developed for the synthesis of functionalized pyrido[2,3-c]coumarin derivatives from ketones, aromatic aldehydes, and 3-aminocoumarin. In this simple and efficient protocol, products were obtained in moderate to good yields (28 examples). The reaction proceeds by an asynchronous [4+2] cycloaddition (inverse-electron-demand Diels–Alder reaction).
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