KF/clinoptilolite nanoparticles as a novel catalyst for the green synthesis of chromens using three component reactions of 4-hydroxycoumarins: Study of antioxidant activity
In this research, the green synthesis of chromen derivatives in good yields is described via three-component reactions of 4-hydroxycumarine, aldehydes or ketones, and methyl ketones in the presence of KF/clinoptilolite nanoparticles (KF/CP-NPs) under solv
Regioselective synthesis of pyrano[3,2-c]coumarins via Cu(II)-catalyzed tandem reaction
Efficient synthesis of pyrano[3,2-c]coumarins has been achieved via copper(II) triflate catalyzed tandem reaction of 4-hydroxycoumarin with α,β-unsaturated carbonyl compounds in high yields. The catalytic reaction proceeded very smoothly under solvent-fre
Bi(OTf)3-catalyzed solvent-free synthesis of pyrano[3,2-c]coumarins through a tandem addition/annulation reaction between chalcones and 4-hydroxycoumarins
A Bi(OTf)3-catalyzed tandem addition/annulation reaction is described in order to synthesize pyrano[3,2-c]coumarins under solvent-free conditions. Substituted/unsubstituted chalcones were conveniently condensed with various 4-hydroxycoumarins b
Gohain, Mukut,Van Tonder, Johannes H.,Bezuidenhoudt, Barend C.B.
p. 3773 - 3776
(2013/07/11)
Gold(III)-catalyzed tandem conjugate addition/annulation of 4-hydroxycoumarins with α,β-unsaturated ketones
An efficient and selective approach for the synthesis of functionalized pyranocoumarins has been developed via a gold(III)-catalyzed tandem conjugate addition/annulation reaction of 4-hydroxycoumarins with α,β- unsaturated ketones.
Ruthenium-catalyzed addition of carboxylic acids or cyclic 1,3-dicarbonyl compounds to propargyl alcohols
Monomeric ruthenium(O) complexes containing redox-coupled dienone ligands were found to catalyze the regio-selective addition of carboxylic acids or cyclic 1,3-dicarbonyl compounds to propargyl alcohols.
Berger, Stefanie,Haak, Edgar
experimental part
p. 6630 - 6634
(2011/02/21)
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