1-Aryl-2-methyl- or 3-methylchromeno[4,3-b]pyrrol-4(1H)-ones have been synthesized in excellent yields by the Pd-catalyzed intramolecular aza-Wacker-type cyclization of 3-allyl-4-arylaminocoumarins or C–H insertion/oxidative cyclization of N-allyl-N-aryl-4-aminocoumarins, respectively, in the presence of Cu(OAc)2 in acetic acid under heating. The starting allylcoumarins have been prepared by the allylation of 4-arylaminocoumarins with allyl bromide in CH3CN in the presence of Cs2CO3 at room temperature. Preliminary biological tests indicated interesting antioxidant activity and significant levels of inhibition of soybean lipoxygenase.
A heterogeneous mesoporous graphitic carbon nitride (mpg-C3N4) photocatalytic 3-trifluoromethylation/perfluoroalkylation of 4-aminocoumarins was realized from 4-aminocoumarins and C
A substrate‐induced synthesis of coumarin‐fused quinolinones is achieved from 4‐(phenylamino)‐2