Microwave Assisted Synthesis of 4-Aryl/Alkylaminocoumarins

4-Aminocoumarin derivatives: synthesis and applications

4-Aminocoumarins represent an important class of a versatile scaffold in organic synthesis and have been consistently used as a building block in organic chemistry for the synthesis of different heterocyclic compounds.

Three-component reaction between Triphenylphosphine, Acetylenic Esters and 4-hydroxycoumarin, 4-(phenylamino)coumarin, 4-hydroxyquinolin-2(1H)-one or 4-hydroxy-1-methylquinolin-2(1H)-one

Three-component reaction between dialkyl acetylenedicarboxylates and triphenylphosphine in the presence of 4-hydroxycoumarin, 4-(phenylamino)coumarin, 4-hydroxyquinolin-2(1 H)-one or 4-hydroxy-1-methylquinolin-2(1 H)-one is described.

General and efficient route for the synthesis of 3,4-disubstituted coumarins via Pd-catalyzed site-selective cross-coupling reactions

Palladium-catalyzed site-selective cross-coupling reactions of 3-bromo-4-trifloxycoumarin or 3-bromo-4-tosyloxycoumarin provide an efficient and facile route for the synthesis of 3,4-disubstituted coumarins, which include 3,4-diarylcoumarins, 3-amino-4-arylcoumarins, and 3-aryl-4-aminocoumarins. The order of reactivity of the (pseudo)halide substituents in the coumarins was found to be 4-OTf > 3-Br > 4-OTs.