A Green One-Pot Synthesis of 4-Hydroxychromenylarylmethyl- 6-Hydroxypyrimidine-2,4-Diones Using Titanium Dioxide Nanowires as an Effective and Recyclable Catalyst.
OBJECTIVE
Since a wide range of biological and pharmaceutical activities of barbituric acid, 4-hydroxycoumarin and their derivatives have been disclosed until now, in the domain of our interest to find newly catalytic routes for highly efficient synthesis of potentially interesting biologically active organic compounds, and extension of their areas, herein we introduce a three component combinatorial reaction based on (N,N-dimethyl)barbituric acid and 4- hydroxycoumarin scaffolds.


METHODS
All starting materials were purchased from Merck chemical company and were applied without further purifications. Catalytic reaction between barbituric acid (or N,N-dimethyl barbituric acid), 4-hydroxycoumarin, and a wide range of aryl aldehydes by employing titanium dioxide nanowires (TiO2 NWs) is successfully performed under solvent-free conditions at 100 °C, and led efficiently to obtain target products.


RESULTS
From loading above mentioned three component reaction, starting materials in the presence of catalytic amounts of TiO2 NWs as a key factor were condensed together via three C-C bond formation to obtain 12 newly prepared compounds. This procedure profits some advantages such as an efficiency, environmental safety and high recyclability of nano-catalyst.


CONCLUSIONS
In this work, by the use of a green adapted method in a condensation three component reaction catalyzed by TiO2 NWs as an efficient nano-catalyst, some newly prepared products were prepared in a one pot, and the scope of potentially interesting biologically active organic compounds which can be duly considered by biologists and pharmacologists was developed.
Department of Chemistry, Yasouj University, P.O. Box 353, Yasouj 75918-74831 Iran. Khalileskandari@yahoo.com.
Khalil
K
Eskandari
Bahador
B
Karami
D015110:4-Hydroxycoumarins / Q000737:chemistry; D001463:Barbiturates / Q000737:chemistry; D002384:Catalysis; D055772:Green Chemistry Technology; D053770:Nanowires / Q000737:chemistry*; D011743:Pyrimidines / Q000138:chemical synthesis*; D059027:Recycling; D014025:Titanium / Q000737:chemistry
D015110:4-Hydroxycoumarins; D001463:Barbiturates; D011743:Pyrimidines; C009495:titanium dioxide; D014025:Titanium; C032232:barbituric acid; C068805:4-hydroxycoumarin